Onboard Message Log Messages

This is a list of log messages which may be present in logs produced and stored onboard ArduPilot vehicles.

[toc exclude="Onboard Message Log Messages"]

ACC

IMU accelerometer data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
I	instance	accelerometer sensor instance number
SampleUS	μs	time since system startup this sample was taken
AccX	m/s/s	acceleration along X axis
AccY	m/s/s	acceleration along Y axis
AccZ	m/s/s	acceleration along Z axis

ADSB

Automatic Dependent Serveillance - Broadcast detected vehicle information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
ICAO_address		Transponder address
Lat	1e-7 deglatitude	Vehicle latitude
Lng	1e-7 deglongitude	Vehicle longitude
Alt	mm	Vehicle altitude
Heading	cdegheading	Vehicle heading
Hor_vel	mm/s	Vehicle horizontal velocity
Ver_vel	mm/s	Vehicle vertical velocity
Squark		Transponder squawk code

AETR

Normalised pre-mixer control surface outputs

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Ail		Pre-mixer value for aileron output (between -4500 and 4500)
Elev		Pre-mixer value for elevator output (between -4500 and 4500)
Thr		Pre-mixer value for throttle output (between -100 and 100)
Rudd		Pre-mixer value for rudder output (between -4500 and 4500)
Flap		Pre-mixer value for flaps output (between 0 and 100)
Steer		Pre-mixer value for steering output (between -4500 and 4500)
SS		Surface movement / airspeed scaling value

AHR2

Backup AHRS data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Roll	deg	Estimated roll
Pitch	deg	Estimated pitch
Yaw	degheading	Estimated yaw
Alt	m	Estimated altitude
Lat	deglatitude	Estimated latitude
Lng	deglongitude	Estimated longitude
Q1		Estimated attitude quaternion component 1
Q2		Estimated attitude quaternion component 2
Q3		Estimated attitude quaternion component 3
Q4		Estimated attitude quaternion component 4

AIS1

Contents of 'position report' AIS message, see: https://gpsd.gitlab.io/gpsd/AIVDM.html#_types_1_2_and_3_position_report_class_a

FieldName	Units/Type	Description
US	μs	Time since system startup
typ		Message Type
rep		Repeat Indicator
mmsi		MMSI
nav		Navigation Status
rot		Rate of Turn (ROT)
sog		Speed Over Ground (SOG)
pos		Position Accuracy
lon		Longitude
lat		Latitude
cog		Course Over Ground (COG)
hed		True Heading (HDG)
sec		Time Stamp
man		Maneuver Indicator
raim		RAIM flag
rad		Radio status

AIS4

Contents of 'Base Station Report' AIS message, see: https://gpsd.gitlab.io/gpsd/AIVDM.html#_type_4_base_station_report

FieldName	Units/Type	Description
US	μs	Time since system startup
rep		Repeat Indicator
mmsi		MMSI
year		Year (UTC)
mth		Month (UTC)
day		Day (UTC)
h		Hour (UTC)
m		Minute (UTC)
s		Second (UTC)
fix		Fix quality
lon		Longitude
lat		Latitude
epfd		Type of EPFD
raim		RAIM flag
rad		Radio status

AIS5

Contents of 'static and voyage related data' AIS message, see: https://gpsd.gitlab.io/gpsd/AIVDM.html#_type_5_static_and_voyage_related_data

FieldName	Units/Type	Description
US	μs	Time since system startup
rep		Repeat Indicator
mmsi		MMSI
ver		AIS Version
imo		IMO Number
cal	char[16]	Call Sign
nam	char[64]	Vessel Name
typ		Ship Type
bow	m	Dimension to Bow
stn	m	Dimension to Stern
prt	m	Dimension to Port
str	m	Dimension to Starboard
fix		Position Fix Type
dght	dm	Draught
dst	char[64]	Destination
dte		DTE

AISR

Raw AIS AVDIM messages contents, see: https://gpsd.gitlab.io/gpsd/AIVDM.html#_aivdmaivdo_sentence_layer

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
num		count of fragments in the currently accumulating message
total		fragment number of this sentence
ID		sequential message ID for multi-sentence messages
payload	char[64]	data payload

ANG

Attitude control attitude

FieldName	Units/Type	Description
TimeUS	μs	Timestamp of the current Attitude loop
DesRoll	deg	vehicle desired roll
Roll	deg	achieved vehicle roll
DesPitch	deg	vehicle desired pitch
Pitch	deg	achieved vehicle pitch
DesYaw	degheading	vehicle desired yaw
Yaw	degheading	achieved vehicle yaw
Dt	s	attitude delta time

AOA

Angle of attack and Side Slip Angle values

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
AOA	deg	Angle of Attack calculated from airspeed, wind vector,velocity vector
SSA	deg	Side Slip Angle calculated from airspeed, wind vector,velocity vector

ARM

Arming status changes

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
ArmState		true if vehicle is now armed
ArmChecks	bitmask	arming bitmask at time of arming
Forced		true if arm/disarm was forced
Method	enum	method used for arming

ARSP

Airspeed sensor data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
I	instance	Airspeed sensor instance number
Airspeed	m/s	Current airspeed
DiffPress	Pa	Pressure difference between static and dynamic port
Temp	degC	Temperature used for calculation
RawPress	Pa	Raw pressure less offset
Offset	Pa	Offset from parameter
U		True if sensor is being used
H		True if sensor is healthy
Hp		Probability sensor is healthy
TR		innovation test ratio
Pri		True if sensor is the primary sensor

ASM1

AirSim simulation data

FieldName	Units/Type	Description
TimeUS		Time since system startup
TUS		Simulation's timestamp
R		Simulation's roll
P		Simulation's pitch
Y		Simulation's yaw
GX		Simulated gyroscope, X-axis
GY		Simulated gyroscope, Y-axis
GZ		Simulated gyroscope, Z-axis

ASM2

More AirSim simulation data

FieldName	Units/Type	Description
TimeUS		Time since system startup
AX		simulation's acceleration, X-axis
AY		simulation's acceleration, Y-axis
AZ		simulation's acceleration, Z-axis
VX		simulation's velocity, X-axis
VY		simulation's velocity, Y-axis
VZ		simulation's velocity, Z-axis
PX		simulation's position, X-axis
PY		simulation's position, Y-axis
PZ		simulation's position, Z-axis
Alt		simulation's gps altitude
SD		simulation's earth-frame speed-down

ATDE

AutoTune data packet

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Angle	deg	current angle
Rate	deg/s	current angular rate

ATRP

Plane AutoTune

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Axis	instance	tuning axis
State		tuning state
Sur	deg	control surface deflection
PSlew	deg/s	P slew rate
DSlew	deg/s	D slew rate
FF0		FF value single sample
FF		FF value
P		P value
I		I value
D		D value
Action		action taken
RMAX	deg/s	Rate maximum
TAU	s	time constant

ATSC

Scale factors for attitude controller

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
AngPScX		Angle P scale X
AngPScY		Angle P scale Y
AngPScZ		Angle P scale Z
PDScX		PD scale X
PDScY		PD scale Y
PDScZ		PD scale Z

ATT

Canonical vehicle attitude

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
DesRoll	deg	vehicle desired roll
Roll	deg	achieved vehicle roll
DesPitch	deg	vehicle desired pitch
Pitch	deg	achieved vehicle pitch
DesYaw	degheading	vehicle desired yaw
Yaw	degheading	achieved vehicle yaw
AEKF		active EKF type

ATUN

Copter/QuadPlane AutoTune

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Axis		which axis is currently being tuned
TuneStep		step in autotune process
Targ	deg	target angle or rate, depending on tuning step
Min	deg	measured minimum target angle or rate
Max	deg	measured maximum target angle or rate
RP		new rate gain P term
RD		new rate gain D term
SP		new angle P term
ddt	m/s/s	maximum measured twitching acceleration

AUXF

Auxiliary function invocation information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
function	instance	ID of triggered function
pos	enum	switch position when function triggered
source	enum	source of auxiliary function invocation
index		index within source. 0 indexed. Invalid for scripting.
result		true if function was successful

BARD

Barometer dynamic data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
I	instance	barometer sensor instance number
DynPrX	Pa	calculated dynamic pressure in the bodyframe X-axis
DynPrY	Pa	calculated dynamic pressure in the bodyframe Y-axis
DynPrZ	Pa	calculated dynamic pressure in the bodyframe Z-axis

BARO

Gathered Barometer data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
I	instance	barometer sensor instance number
Alt	m	calculated altitude
AltAMSL	m	altitude AMSL
Press	Pa	measured atmospheric pressure
Temp	degC	measured atmospheric temperature
CRt	m/s	derived climb rate from primary barometer
SMS	ms	time last sample was taken
Offset	m	raw adjustment of barometer altitude, zeroed on calibration, possibly set by GCS
GndTemp	degC	temperature on ground, specified by parameter or measured while on ground
H		true if barometer is considered healthy
CPress	Pa	compensated atmospheric pressure

BAT

Gathered battery data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Inst	instance	battery instance number
Volt	V	measured voltage
VoltR	V	estimated resting voltage
Curr	A	measured current
CurrTot	mAh	consumed Ah, current * time
EnrgTot	W.h	consumed Wh, energy this battery has expended
Temp	degC	measured temperature
Res	Ohm	estimated battery resistance
RemPct	%	remaining percentage
H		health
SH	%	state of health percentage. 0 if unknown

BCL

Battery cell voltage information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Instance	instance	battery instance number
Volt	V	battery voltage
V1	mV	first cell voltage
V2	mV	second cell voltage
V3	mV	third cell voltage
V4	mV	fourth cell voltage
V5	mV	fifth cell voltage
V6	mV	sixth cell voltage
V7	mV	seventh cell voltage
V8	mV	eighth cell voltage
V9	mV	ninth cell voltage
V10	mV	tenth cell voltage
V11	mV	eleventh cell voltage
V12	mV	twelfth cell voltage

BCL2

Battery cell voltage information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Instance	instance	battery instance number
V13	mV	thirteenth cell voltage
V14	mV	fourteenth cell voltage

BCN

Beacon information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Health		True if beacon sensor is healthy
Cnt		Number of beacons being used
D0	m	Distance to first beacon
D1	m	Distance to second beacon
D2	m	Distance to third beacon
D3	m	Distance to fourth beacon
PosX	m	Calculated beacon position, x-axis
PosY	m	Calculated beacon position, y-axis
PosZ	m	Calculated beacon position, z-axis

CAFD

CANFD Frame

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Bus	instance	bus number
Id		frame identifier
DLC		data length code
D0		data 0
D1		data 1
D2		data 2
D3		data 3
D4		data 4
D5		data 5
D6		data 6
D7		data 7

CAM

Camera shutter information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
I	instance	Instance number
Img		Image number
GPSTime		milliseconds since start of GPS week
GPSWeek		weeks since 5 Jan 1980
Lat	deglatitude	current latitude
Lng	deglongitude	current longitude
Alt	m	current altitude
RelAlt	m	current altitude relative to home
GPSAlt	m	altitude as reported by GPS
R	deg	current vehicle roll
P	deg	current vehicle pitch
Y	deg	current vehicle yaw

CAND

Info from GetNodeInfo request

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Driver		Driver index
NodeId	instance	Node ID
UID1		Hardware ID, part 1
UID2		Hardware ID, part 2
Name	char[64]	Name string
Major		major revision id
Minor		minor revision id
Version		AP_Periph git hash

CANF

CAN Frame

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Bus	instance	bus number
Id		frame identifier
DLC		data length code
B0		byte 0
B1		byte 1
B2		byte 2
B3		byte 3
B4		byte 4
B5		byte 5
B6		byte 6
B7		byte 7

CANS

CAN Bus Statistics

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
I	instance	driver index
T		transmit success count
Trq		transmit request count
Trej		transmit reject count
Tov		transmit overflow count
Tto		transmit timeout count
Tab		transmit abort count
R		receive count
Rov		receive overflow count
Rer		receive error count
Bo		bus offset error count
Etx		ESC successful send count
Stx		Servo successful send count
Ftx		ESC/Servo failed-to-send count

CC

Custom Controller data

FieldName	Units/Type	Description
TimeUS		Time since system startup
Type	enum	controller type
Act		true if controller is active

CMD

Uploaded mission command information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
CTot		Total number of mission commands
CNum		This command's offset in mission
CId		Command type
Prm1		Parameter 1
Prm2		Parameter 2
Prm3		Parameter 3
Prm4		Parameter 4
Lat	deglatitude	Command latitude
Lng	deglongitude	Command longitude
Alt	m	Command altitude
Frame		Frame used for position

CSRV

Servo feedback data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Id	instance	Servo number this data relates to
Pos	deg	Current servo position
Force	N.m	Force being applied
Speed	deg/s	Current servo movement speed
Pow	%	Amount of rated power being applied
PosCmd	deg	commanded servo position
V	V	Voltage
A	A	Current
MotT	degC	motor temperature
PCBT	degC	PCB temperature
Err		error flags

CTUN

Control Tuning information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
NavRoll	deg	desired roll
Roll	deg	achieved roll
NavPitch	deg	desired pitch assuming pitch trims are already applied
Pitch	deg	achieved pitch assuming pitch trims are already applied,ie "0deg" is level flight trimmed pitch attitude as shown on artificial horizon level line.
ThO		scaled output throttle
RdO		scaled output rudder
ThD		demanded speed-height-controller throttle
As	m/s	airspeed estimate (or measurement if airspeed sensor healthy and ARSPD_USE>0)
AsT	enum	airspeed type ( old estimate or source of new estimate)
SAs	m/s	DCM's airspeed estimate, NaN if not available
E2T		equivalent to true airspeed ratio
GU	cm/s	groundspeed undershoot when flying with minimum groundspeed

DCM

DCM Estimator Data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Roll	deg	estimated roll
Pitch	deg	estimated pitch
Yaw	deg	estimated yaw
ErrRP	deg	lowest estimated gyro drift error
ErrYaw	degheading	difference between measured yaw and DCM yaw estimate
VWN	m/s	wind velocity, to-the-North component
VWE	m/s	wind velocity, to-the-East component
VWD	m/s	wind velocity, Up-to-Down component

DMS

DataFlash-Over-MAVLink statistics

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
N		Current block number
Dp		Number of times we rejected a write to the backend
RT		Number of blocks sent from the retry queue
RS		Number of resends of unacknowledged data made
Fa		Average number of blocks on the free list
Fmn		Minimum number of blocks on the free list
Fmx		Maximum number of blocks on the free list
Pa		Average number of blocks on the pending list
Pmn		Minimum number of blocks on the pending list
Pmx		Maximum number of blocks on the pending list
Sa		Average number of blocks on the sent list
Smn		Minimum number of blocks on the sent list
Smx		Maximum number of blocks on the sent list

DSF

Onboard logging statistics

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Dp		Number of times we rejected a write to the backend
Blk		Current block number
Bytes	B	Current write offset
FMn		Minimum free space in write buffer in last time period
FMx		Maximum free space in write buffer in last time period
FAv		Average free space in write buffer in last time period

DSTL

Deepstall Landing data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Stg		Deepstall landing stage
THdg	degheading	Target heading
Lat	deglatitude	Landing point latitude
Lng	deglongitude	Landing point longitude
Alt	m	Landing point altitude
XT		Crosstrack error
Travel		Expected travel distance vehicle will travel from this point
L1I		L1 controller crosstrack integrator value
Loiter		wind estimate loiter angle flown
Des		Deepstall steering PID desired value
P		Deepstall steering PID Proportional response component
I		Deepstall steering PID Integral response component
D		Deepstall steering PID Derivative response component

EAHR

External AHRS data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Roll	deg	euler roll
Pitch	deg	euler pitch
Yaw	deg	euler yaw
VN	m/s	velocity north
VE	m/s	velocity east
VD	m/s	velocity down
Lat	deglatitude	latitude
Lon	deglongitude	longitude
Alt	m	altitude AMSL
Flg		nav status flags

EAHV

External AHRS variances

FieldName	Units/Type	Description
TimeUS		Time since system startup
Vel		velocity variance
Pos		position variance
Hgt		height variance
MagX		magnetic variance, X
MagY		magnetic variance, Y
MagZ		magnetic variance, Z
TAS		true airspeed variance

ECYL

EFI per-cylinder information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Inst	instance	Cylinder this data belongs to
IgnT	deg	Ignition timing
InjT	ms	Injection time
CHT	degC	Cylinder head temperature
EGT	degC	Exhaust gas temperature
Lambda		Estimated lambda coefficient (dimensionless ratio)
CHT2	degC	Cylinder2 head temperature
EGT2	degC	Cylinder2 Exhaust gas temperature
IDX		Index of the publishing ECU

EDT2

Status received from ESCs via Extended DShot telemetry v2

FieldName	Units/Type	Description
TimeUS	μs	microseconds since system startup
Instance	instance	ESC instance number
Stress		current stress level (commutation effort), scaled to [0..255]
MaxStress		maximum stress level (commutation effort) since arming, scaled to [0..15]
Status	bitmask	status bits

EFI

Electronic Fuel Injection system data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
LP	%	Reported engine load
Rpm	rpm	Reported engine RPM
SDT	ms	Spark Dwell Time
ATM	Pa	Atmospheric pressure
IMP	Pa	Intake manifold pressure
IMT	degC	Intake manifold temperature
ECT	degC	Engine Coolant Temperature
OilP	Pa	Oil Pressure
OilT	degC	Oil temperature
FP	Pa	Fuel Pressure
FCR		Fuel Consumption Rate
CFV		Consumed fuel volume
TPS	%	Throttle Position
IDX		Index of the publishing ECU

EFI2

Electronic Fuel Injection system data - redux

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Healthy		True if EFI is healthy
ES		Engine state
GE		General error
CSE		Crankshaft sensor status
TS		Temperature status
FPS		Fuel pressure status
OPS		Oil pressure status
DS		Detonation status
MS		Misfire status
DebS		Debris status
SPU		Spark plug usage
IDX		Index of the publishing ECU

EFIS

Electronic Fuel Injection data - Hirth specific Status information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
EET	bitmask	Error Excess Temperature Bitfield
FLAG	bitmask	Sensor Status Bitfield
CRF		CRC failure count
AKF		ACK failure count
Up		Uptime between 2 messages
ThO		Throttle output as received by the engine
ThM		Modified throttle_to_hirth output sent to the engine

ERR

Specifically coded error messages

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Subsys	enum	Subsystem in which the error occurred
ECode		Subsystem-specific error code

ESC

Feedback received from ESCs

FieldName	Units/Type	Description
TimeUS	μs	microseconds since system startup
Instance	instance	ESC instance number
RPM	rpm	reported motor rotation rate
RawRPM	rpm	reported motor rotation rate without slew adjustment
Volt	V	Perceived input voltage for the ESC
Curr	A	Perceived current through the ESC
Temp	degC	ESC temperature in centi-degrees C
CTot	mAh	current consumed total mAh
MotTemp	degC	measured motor temperature in centi-degrees C
Err	%	error rate

ESCX

ESC extended telemetry data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Instance	instance	starts from 0
inpct	%	input duty cycle in percent
outpct	%	output duty cycle in percent
flags		manufacturer-specific status flags
Pwr	%	Power percentage

EV

Specifically coded event messages

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Id	enum	Event identifier

FCN

Filter Center Message - per motor

FieldName	Units/Type	Description
TimeUS	μs	microseconds since system startup
I	instance	instance
NF		total number of active harmonic notches
CF1	Hz	First harmonic centre frequency for motor 1
CF2	Hz	First harmonic centre frequency for motor 2
CF3	Hz	First harmonic centre frequency for motor 3
CF4	Hz	First harmonic centre frequency for motor 4
CF5	Hz	First harmonic centre frequency for motor 5
CF6	Hz	First harmonic centre frequency for motor 6
HF1	Hz	Second harmonic centre frequency for motor 1
HF2	Hz	Second harmonic centre frequency for motor 2
HF3	Hz	Second harmonic centre frequency for motor 3
HF4	Hz	Second harmonic centre frequency for motor 4
HF5	Hz	Second harmonic centre frequency for motor 5
HF6	Hz	Second harmonic centre frequency for motor 6

FCNS

Filter Center Message

FieldName	Units/Type	Description
TimeUS	μs	microseconds since system startup
I	instance	instance
CF	Hz	notch centre frequency
HF	Hz	2nd harmonic frequency

FENC

Fence status - development diagnostic message

FieldName	Units/Type	Description
TimeUS		Time since system startup
EN		bitmask of enabled fences
AE		bitmask of automatically enabled fences
CF		bitmask of configured-in-parameters fences
EF		bitmask of enabled fences
DF		bitmask of currently disabled fences
Alt		current vehicle altitude

FILE

File data

FieldName	Units/Type	Description
FileName	char[16]	File name
Offset		Offset into the file of this block
Length		Length of this data block
Data	char[64]	File data of this block

FMT

More information

Message defining the format of messages in this file

FieldName	Units/Type	Description
Type		unique-to-this-log identifier for message being defined
Length	B	the number of bytes taken up by this message (including all headers)
Name	char[4]	name of the message being defined
Format	char[16]	character string defining the C-storage-type of the fields in this message
Columns	char[64]	the labels of the message being defined

FMTU

Message defining units and multipliers used for fields of other messages

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
FmtType		numeric reference to associated FMT message
UnitIds	char[16]	each character refers to a UNIT message. The unit at an offset corresponds to the field at the same offset in FMT.Format
MultIds	char[16]	each character refers to a MULT message. The multiplier at an offset corresponds to the field at the same offset in FMT.Format

FNCE

currently loaded Geo Fence points

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Tot		total number of stored items
Seq		index in current sequence
Type		point type
Lat	deglatitude	point latitude
Lng	deglongitude	point longitude
Count		vertex cound in polygon if applicable
Radius	m	radius of circle if applicable

FOLL

Follow library diagnostic data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup (microseconds)
Lat	deglatitude	Target latitude (degrees * 1E7)
Lon	deglongitude	Target longitude (degrees * 1E7)
Alt	cm	Target absolute altitude (centimeters)
VelN	m/s	Target velocity, North (m/s)
VelE	m/s	Target velocity, East (m/s)
VelD	m/s	Target velocity, Down (m/s)
LatE	deglatitude	Vehicle estimated latitude (degrees * 1E7)
LonE	deglongitude	Vehicle estimated longitude (degrees * 1E7)
AltE	cm	Vehicle estimated absolute altitude (centimeters)

FTN

Filter Tuning Message - per motor

FieldName	Units/Type	Description
TimeUS	μs	microseconds since system startup
I	instance	instance
NDn		number of active harmonic notches
NF1	Hz	desired harmonic notch centre frequency for motor 1
NF2	Hz	desired harmonic notch centre frequency for motor 2
NF3	Hz	desired harmonic notch centre frequency for motor 3
NF4	Hz	desired harmonic notch centre frequency for motor 4
NF5	Hz	desired harmonic notch centre frequency for motor 5
NF6	Hz	desired harmonic notch centre frequency for motor 6
NF7	Hz	desired harmonic notch centre frequency for motor 7
NF8	Hz	desired harmonic notch centre frequency for motor 8
NF9	Hz	desired harmonic notch centre frequency for motor 9
NF10	Hz	desired harmonic notch centre frequency for motor 10
NF11	Hz	desired harmonic notch centre frequency for motor 11
NF12	Hz	desired harmonic notch centre frequency for motor 12

FTN1

FFT Filter Tuning

FieldName	Units/Type	Description
TimeUS	μs	microseconds since system startup
PkAvg	Hz	peak noise frequency as an energy-weighted average of roll and pitch peak frequencies
BwAvg	Hz	bandwidth of weighted peak frequency where edges are determined by FFT_ATT_REF
SnX		signal-to-noise ratio on the roll axis
SnY		signal-to-noise ratio on the pitch axis
SnZ		signal-to-noise ratio on the yaw axis
FtX	%	harmonic fit on roll of the highest noise peak to the second highest noise peak
FtY	%	harmonic fit on pitch of the highest noise peak to the second highest noise peak
FtZ	%	harmonic fit on yaw of the highest noise peak to the second highest noise peak
FHX		FFT health, X-axis
FHY		FFT health, Y-axis
FHZ		FFT health, Z-axis
Tc	μs	FFT cycle time

FTN2

FFT Noise Frequency Peak

FieldName	Units/Type	Description
TimeUS	μs	microseconds since system startup
Id	instance	peak id where 0 is the centre peak, 1 is the lower shoulder and 2 is the upper shoulder
PkX	Hz	noise frequency of the peak on roll
PkY	Hz	noise frequency of the peak on pitch
PkZ	Hz	noise frequency of the peak on yaw
BwX	Hz	bandwidth of the peak frequency on roll where edges are determined by FFT_ATT_REF
BwY	Hz	bandwidth of the peak frequency on pitch where edges are determined by FFT_ATT_REF
BwZ	Hz	bandwidth of the peak frequency on yaw where edges are determined by FFT_ATT_REF
SnX		signal-to-noise ratio on the roll axis
SnY		signal-to-noise ratio on the pitch axis
SnZ		signal-to-noise ratio on the yaw axis
EnX		power spectral density bin energy of the peak on roll
EnY		power spectral density bin energy of the peak on roll
EnZ		power spectral density bin energy of the peak on roll

FTN3

Additional FFT Noise Frequency Peak

FieldName	Units/Type	Description
TimeUS	μs	microseconds since system startup
Id	instance	update axis
Pk1	Hz	Peak 1 frequency
Pk2	Hz	Peak 2 frequency
Pk3	Hz	Peak 3 Frequency
Bw1	Hz	Peak 1 noise bandwidth
Bw2	Hz	Peak 2 noise bandwidth
Bw3	Hz	Peak 3 noise bandwidth
En1		Peak 1 Maximum energy
En2		Peak 2 Maximum energy
En3		Peak 3 Maximum energy

FTNS

Filter Tuning Message

FieldName	Units/Type	Description
TimeUS	μs	microseconds since system startup
I	instance	instance
NF	Hz	desired harmonic notch centre frequency

FWDT

Forward Throttle calculations

FieldName	Units/Type	Description
TimeUS		Time since system startup
fts		forward throttle scaler
qfplcd		quadplane forward pitch limit
npllcd		navigation pitch lower limit
npcd		demanded navigation pitch
qft		quadplane forward throttle
npulcd		upper limit for navigation pitch

GLT

Simulated Glider Angles and coefficients

FieldName	Units/Type	Description
TimeUS		Time since system startup
Alpha		alpha angle
Beta		beta angle
Cl		lift coefficent
Cm		roll coffecient
Cn		yaw coefficient

GPA

GPS accuracy information

FieldName	Units/Type	Description
I	μs	GPS instance number
TimeUS	instance	Time since system startup
VDop		vertical dilution of precision
HAcc	m	horizontal position accuracy
VAcc	m	vertical position accuracy
SAcc	m/s	speed accuracy
YAcc	deg	yaw accuracy
VV		true if vertical velocity is available
SMS	ms	time since system startup this sample was taken
Delta	ms	system time delta between the last two reported positions
AEl	m	altitude above WGS-84 ellipsoid; INT32_MIN (-2147483648) if unknown
RTCMFU		RTCM fragments used
RTCMFD		RTCM fragments discarded

GPS

Information received from GNSS systems attached to the autopilot

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
I	instance	GPS instance number
Status	enum	GPS Fix type; 2D fix, 3D fix etc.
GMS	ms	milliseconds since start of GPS Week
GWk		weeks since 5 Jan 1980
NSats	satellites	number of satellites visible
HDop		horizontal dilution of precision
Lat	deglatitude	latitude
Lng	deglongitude	longitude
Alt	m	altitude
Spd	m/s	ground speed
GCrs	degheading	ground course
VZ	m/s	vertical speed
Yaw	degheading	vehicle yaw
U		boolean value indicating whether this GPS is in use

GPYW

GPS Yaw

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Id	instance	instance
RHD	deg	reported heading,deg
RDist	m	antenna separation,m
RDown	m	vertical antenna separation,m
MinCDown	m	minimum tolerable vertical antenna separation,m
MaxCDown	m	maximum tolerable vertical antenna separation,m
OK		1 if have yaw

GRAW

Raw uBlox data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
WkMS	ms	receiver TimeOfWeek measurement
Week		GPS week
numSV	satellites	number of space vehicles seen
sv		space vehicle number of first vehicle
cpMes		carrier phase measurement
prMes		pseudorange measurement
doMes		Doppler measurement
mesQI		measurement quality index
cno		carrier-to-noise density ratio
lli		loss of lock indicator

GRXH

Raw uBlox data - header

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
rcvTime		receiver TimeOfWeek measurement
week		GPS week
leapS		GPS leap seconds
numMeas		number of space-vehicle measurements to follow
recStat		receiver tracking status bitfield

GRXS

Raw uBlox data - space-vehicle data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
prMes		Pseudorange measurement
cpMes		Carrier phase measurement
doMes		Doppler measurement
gnss		GNSS identifier
sv		Satellite identifier
freq		GLONASS frequency slot
lock		carrier phase locktime counter
cno		carrier-to-noise density ratio
prD		estimated pseudorange measurement standard deviation
cpD		estimated carrier phase measurement standard deviation
doD		estimated Doppler measurement standard deviation
trk		tracking status bitfield

GYR

IMU gyroscope data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
I	instance	gyroscope sensor instance number
SampleUS	μs	time since system startup this sample was taken
GyrX	rad/s	measured rotation rate about X axis
GyrY	rad/s	measured rotation rate about Y axis
GyrZ	rad/s	measured rotation rate about Z axis

HEAT

IMU Heater data

FieldName	Units/Type	Description
TimeUS		Time since system startup
Temp		Current IMU temperature
Targ		Target IMU temperature
P		Proportional portion of response
I		Integral portion of response
Out		Controller output to heating element

HRSC

Helicopter related messages

FieldName	Units/Type	Description
I	μs	Instance, 0=Main, 1=Tail
TimeUS	instance	Time since system startup
DRRPM		Desired rotor speed
ERRPM		Estimated rotor speed
Gov		Governor Output
Throt		Throttle output
Ramp		throttle ramp up
Stat		RSC state

HYGR

Hygrometer data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Id	instance	sensor ID
Humidity	%	percentage humidity
Temp	degC	temperature in degrees C

ICMB

ICM20789 diagnostics

FieldName	Units/Type	Description
TimeUS		Time since system startup
Traw		raw temperature from sensor
Praw		raw pressure from sensor
P		pressure
T		temperature

IE24

More information

Intelligent Energy Fuel Cell generator (legacy protocol)

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
FUEL	1e2 %	Fuel remaining
SPMPWR	Watt	stack power module power draw
POUT	Watt	output power
ERR	enum	error codes

IEFC

More information

Intelligent Energy Fuel Cell generator

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Tank	%	Fuel remaining
Inlet		Inlet pressure
BattV	V	battery voltage
OutPwr	Watt	output power
SPMPwr	Watt	stack power module power draw
FNo		fault number
BPwr	Watt	battery power draw
State	enum	generator state
F1	enum	error code
F2		sub-error code

ILB1

InertialLabs AHRS data1

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
GMS		GPS INS time (round)
GyrX	deg/s	Gyro X
GyrY	deg/s	Gyro Y
GyrZ	deg/s	Gyro z
AccX	m/s/s	Accelerometer X
AccY	m/s/s	Accelerometer Y
AccZ	m/s/s	Accelerometer Z

ILB2

InertialLabs AHRS data2

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
GMS		GPS INS time (round)
MagX		Magnetometer X
MagY		Magnetometer Y
MagZ		Magnetometer Z

ILB3

InertialLabs AHRS data3

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
GMS		GPS INS time (round)
Press	Pa	Static pressure
Diff	Pa	Differential pressure
Temp	degC	Temperature
Alt	m	Baro altitude
TAS	m/s	true airspeed
VWN	m/s	Wind velocity north
VWE	m/s	Wind velocity east
VWD	m/s	Wind velocity down
ADU		Air Data Unit status

ILB4

InertialLabs AHRS data4

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
GMS		GNSS Position timestamp
GWk		GPS Week
NSat		Number of satellites
NewGPS		Indicator of new update of GPS data
Lat	deglatitude	GNSS Latitude
Lng	deglongitude	GNSS Longitude
Alt	m	GNSS Altitude
GCrs	degheading	GNSS Track over ground
Spd	m/s	GNSS Horizontal speed
VZ	m/s	GNSS Vertical speed

ILB5

InertialLabs AHRS data5

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
GMS		GNSS Position timestamp
FType		fix type
GSS		GNSS spoofing status
GJS		GNSS jamming status
GI1		GNSS Info1
GI2		GNSS Info2
GAPS		GNSS Angles position type

ILB6

InertialLabs AHRS data6

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
GMS		GNSS Position timestamp
GpsHTS		GNSS Heading timestamp
GpsYaw	degheading	GNSS Heading
GpsPitch	deg	GNSS Pitch
GDOP		GNSS GDOP
PDOP		GNSS PDOP
HDOP		GNSS HDOP
VDOP		GNSS VDOP
TDOP		GNSS TDOP

ILB7

InertialLabs AHRS data7

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
GMS		GPS INS time (round)
Roll	deg	euler roll
Pitch	deg	euler pitch
Yaw	deg	euler yaw
VN	m/s	velocity north
VE	m/s	velocity east
VD	m/s	velocity down
Lat	deglatitude	latitude
Lng	deglongitude	longitude
Alt	m	altitude MSL
USW		USW1
USW2		USW2
Vdc	V	Supply voltage

ILB8

InertialLabs AHRS data8

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
GMS		GPS INS time (round)
PVN	m	position variance north
PVE	m	position variance east
PVD	m	position variance down
VVN	m/s	velocity variance north
VVE	m/s	velocity variance east
VVD	m/s	velocity variance down

IMU

Inertial Measurement Unit data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
I	instance	IMU sensor instance number
GyrX	rad/s	measured rotation rate about X axis
GyrY	rad/s	measured rotation rate about Y axis
GyrZ	rad/s	measured rotation rate about Z axis
AccX	m/s/s	acceleration along X axis
AccY	m/s/s	acceleration along Y axis
AccZ	m/s/s	acceleration along Z axis
EG		gyroscope error count
EA		accelerometer error count
T	degC	IMU temperature
GH		gyroscope health
AH		accelerometer health
GHz	Hz	gyroscope measurement rate
AHz	Hz	accelerometer measurement rate

IOMC

IOMCU diagnostic information

FieldName	Units/Type	Description
TimeUS		Time since system startup
RSErr		Status Read error count (zeroed on successful read)
Mem		Free memory
TS		IOMCU uptime
NPkt		Number of packets received by IOMCU
Nerr		Protocol failures on MCU side
Nerr2		Reported number of failures on IOMCU side
NDel		Number of delayed packets received by MCU

IREG

IMU Register unexpected value change

FieldName	Units/Type	Description
TimeUS		Time since system startup
DevID		bus ID
Bank		device register bank
Reg		device register
Val		unexpected value

ISBD

InertialSensor Batch Logging Data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
N		batch sequence number
seqno		sample sequence number
x	m/s/s	x-axis sample value
y	m/s/s	y-axis sample value
z	m/s/s	z-axis sample value

ISBH

InertialSensor Batch Logging Header

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
N		batch sequence number
type		indicates if this is accel or gyro data
instance		IMU sensor instance
mul		multiplier to be applied to samples in this batch
smp_cnt		samples in this batch
SampleUS	μs	timestamp of first sample
smp_rate	Hz	rate at which samples have been collected

JSN1

Log data received from JSON simulator

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup (us)
TStamp	s	Simulation's timestamp (s)
R	rad	Simulation's roll (rad)
P	rad	Simulation's pitch (rad)
Y	rad	Simulation's yaw (rad)
GX	rad/s	Simulated gyroscope, X-axis (rad/sec)
GY	rad/s	Simulated gyroscope, Y-axis (rad/sec)
GZ	rad/s	Simulated gyroscope, Z-axis (rad/sec)

JSN2

Log data received from JSON simulator

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup (us)
VN	m/s	simulation's velocity, North-axis (m/s)
VE	m/s	simulation's velocity, East-axis (m/s)
VD	m/s	simulation's velocity, Down-axis (m/s)
AX	m/s/s	simulation's acceleration, X-axis (m/s^2)
AY	m/s/s	simulation's acceleration, Y-axis (m/s^2)
AZ	m/s/s	simulation's acceleration, Z-axis (m/s^2)
AN	m/s/s	simulation's acceleration, North (m/s^2)
AE	m/s/s	simulation's acceleration, East (m/s^2)
AD	m/s/s	simulation's acceleration, Down (m/s^2)

LAND

Slope Landing data

FieldName	Units/Type	Description
TimeUS		Time since system startup
stage		progress through landing sequence
f1		Landing flags
f2		Slope-specific landing flags
slope		Slope to landing point
slopeInit		Initial slope to landing point
altO		Rangefinder correction
fh		Height for flare timing.

LGR

Landing gear information

FieldName	Units/Type	Description
TimeUS		Time since system startup
LandingGear	enum	Current landing gear state
WeightOnWheels	enum	Weight on wheels state

LOEC

Gathered Loweheiser EFI/Governor telemetry

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
SI		target system ID
CI		target component ID
C		command
I	instance	efi index
ES		desired engine state (0:EFI off 1:EFI on)
GS		desired governor state (0:Governor off 1:Governor on)
Thr		manual throttle value
Strtr		desired electric start

LOEG

Gathered Loweheiser EFI/Governor telemetry

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
I	instance	EFI/Gov sensor instance number
VB	V	battery voltage
CB	A	battery current
CG	A	generator current
Th	%	throttle input
EB	V	EFI battery voltage
RPM	rpm	generator RPM
PW	μs	EFI pulse-width
FF	l/s	fuel flow
FC	l	fuel consumed
EP	Pa	EFI pressure
EMT	degC	EFI manifold air temperature
CHT	degC	cylinder head temperature
TPS	%	throttle position sensor

MAG

Information received from compasses

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
I	instance	magnetometer sensor instance number
MagX	mGauss	magnetic field strength in body frame
MagY	mGauss	magnetic field strength in body frame
MagZ	mGauss	magnetic field strength in body frame
OfsX	mGauss	magnetic field offset in body frame
OfsY	mGauss	magnetic field offset in body frame
OfsZ	mGauss	magnetic field offset in body frame
MOX	mGauss	motor interference magnetic field offset in body frame
MOY	mGauss	motor interference magnetic field offset in body frame
MOZ	mGauss	motor interference magnetic field offset in body frame
Health		true if the compass is considered healthy
S	μs	time measurement was taken

MAGH

Magnetometer high resolution data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Node	instance	CAN node
Sensor		sensor ID on node
Bus		CAN bus
Mx		X axis field
My		y axis field
Mz		z axis field

MAV

GCS MAVLink link statistics

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
chan	instance	mavlink channel number
txp		transmitted packet count
rxp		received packet count
rxdp		perceived number of packets we never received
flags	bitmask	compact representation of some state of the channel
ss	ms	stream slowdown is the number of ms being added to each message to fit within bandwidth
tf		times buffer was full when a message was going to be sent
mgs	ms	time MAV_GCS_SYSID heartbeat (or manual control) last seen

MAVC

MAVLink command we have just executed

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
TS		target system for command
TC		target component for command
SS		source system for command
SC		source component for command
Fr		command frame
Cmd		mavlink command enum value
P1		first parameter from mavlink packet
P2		second parameter from mavlink packet
P3		third parameter from mavlink packet
P4		fourth parameter from mavlink packet
X		X coordinate from mavlink packet
Y		Y coordinate from mavlink packet
Z		Z coordinate from mavlink packet
Res		command result being returned from autopilot
WL		true if this command arrived via a COMMAND_LONG rather than COMMAND_INT

MCU

MCU voltage and temprature monitering

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
MTemp	degC	Temperature
MVolt	V	Voltage
MVmin	V	Voltage min
MVmax	V	Voltage max

MISE

Executed mission command information; emitted when we start to run an item

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
CTot		Total number of mission commands
CNum		This command's offset in mission
CId		Command type
Prm1		Parameter 1
Prm2		Parameter 2
Prm3		Parameter 3
Prm4		Parameter 4
Lat	deglatitude	Command latitude
Lng	deglongitude	Command longitude
Alt	m	Command altitude
Frame		Frame used for position

MMO

MMC3416 compass data

FieldName	Units/Type	Description
TimeUS		Time since system startup
Nx		new measurement X axis
Ny		new measurement Y axis
Nz		new measurement Z axis
Ox		new offset X axis
Oy		new offset Y axis
Oz		new offset Z axis

MNT

Mount's desired and actual roll, pitch and yaw angles

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
I	instance	Instance number
DRoll	deg	Desired roll
Roll	deg	Actual roll
DPitch	deg	Desired pitch
Pitch	deg	Actual pitch
DYawB	deg	Desired yaw in body frame
YawB	deg	Actual yaw in body frame
DYawE	deg	Desired yaw in earth frame
YawE	deg	Actual yaw in earth frame
Dist	m	Rangefinder distance

MODE

vehicle control mode information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Mode		vehicle-specific mode number
ModeNum		alias for Mode
Rsn	enum	reason for entering this mode; enumeration value

MON

Main loop performance monitoring message.

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Dly		Loop delay so far
Tsk		Current task
IErr		Internal error mask
IErrCnt		Count of internal error occurances
IErrLn		Internal Error line
MM		MAVLink message currently being processed
MC		MAVLink command currently being processed
SmLn		If semaphore taken, line of semaphore take call
SPICnt		count of SPI transactions
I2CCnt		count of i2c transactions

MOTB

Motor mixer information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
LiftMax		Maximum motor compensation gain
BatVolt		Ratio between detected battery voltage and maximum battery voltage
ThLimit		Throttle limit set due to battery current limitations
ThrAvMx		Maximum average throttle that can be used to maintain attitude control, derived from throttle mix params
ThrOut		Throttle output
FailFlags		bit 0 motor failed, bit 1 motors balanced, should be 2 in normal flight

MSG

Textual messages

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Message	char[64]	message text

MULT

Message mapping from single character to numeric multiplier

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Id		character referenced by FMTU
Mult		numeric multiplier

NKF0

EKF2 beacon sensor diagnostics

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF2 core this data is for
ID		Beacon sensor ID
rng	m	Beacon range
innov		Beacon range innovation
SIV		sqrt of beacon range innovation variance
TR		Beacon range innovation consistency test ratio
BPN	m	Beacon north position
BPE	m	Beacon east position
BPD	m	Beacon down position
OFH	m	High estimate of vertical position offset of beacons rel to EKF origin
OFL	m	Low estimate of vertical position offset of beacons rel to EKF origin
OFN	m	always zero
OFE	m	always zero
OFD	m	always zero

NKF1

EKF2 estimator outputs

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF2 core this data is for
Roll	deg	Estimated roll
Pitch	deg	Estimated pitch
Yaw	degheading	Estimated yaw
VN	m/s	Estimated velocity (North component)
VE	m/s	Estimated velocity (East component)
VD	m/s	Estimated velocity (Down component)
dPD	m/s	Filtered derivative of vertical position (down)
PN	m	Estimated distance from origin (North component)
PE	m	Estimated distance from origin (East component)
PD	m	Estimated distance from origin (Down component)
GX	deg/s	Estimated gyro bias, X axis
GY	deg/s	Estimated gyro bias, Y axis
GZ	deg/s	Estimated gyro bias, Z axis
OH	m	Height of origin above WGS-84

NKF2

EKF2 estimator secondary outputs

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF2 core this data is for
AZbias		Estimated accelerometer Z bias
GSX		Gyro Scale Factor (X-axis)
GSY		Gyro Scale Factor (Y-axis)
GSZ		Gyro Scale Factor (Z-axis)
VWN	m/s	Estimated wind velocity (moving-to-North component)
VWE	m/s	Estimated wind velocity (moving-to-East component)
MN	mGauss	Magnetic field strength (North component)
ME	mGauss	Magnetic field strength (East component)
MD	mGauss	Magnetic field strength (Down component)
MX	mGauss	Magnetic field strength (body X-axis)
MY	mGauss	Magnetic field strength (body Y-axis)
MZ	mGauss	Magnetic field strength (body Z-axis)
MI		Magnetometer used for data

NKF3

EKF2 innovations

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF2 core this data is for
IVN	m/s	Innovation in velocity (North component)
IVE	m/s	Innovation in velocity (East component)
IVD	m/s	Innovation in velocity (Down component)
IPN	m	Innovation in position (North component)
IPE	m	Innovation in position (East component)
IPD	m	Innovation in position (Down component)
IMX	mGauss	Innovation in magnetic field strength (X-axis component)
IMY	mGauss	Innovation in magnetic field strength (Y-axis component)
IMZ	mGauss	Innovation in magnetic field strength (Z-axis component)
IYAW	deg	Innovation in vehicle yaw
IVT	UNKNOWN	Innovation in true-airspeed
RErr		Accumulated relative error of this core with respect to active primary core
ErSc		A consolidated error score where higher numbers are less healthy

NKF4

EKF2 variances SV, SP, SH and SM are probably best described as 'Squared Innovation Test Ratios' where values <1 tells us the measurement was accepted and >1 tells us it was rejected. They represent the square of the (innovation / maximum allowed innovation) where the innovation is the difference between predicted and measured value and the maximum allowed innovation is determined from the uncertainty of the measurement, uncertainty of the prediction and scaled using the number of standard deviations set by the innovation gate parameter for that measurement, eg EK2_MAG_I_GATE, EK2_HGT_I_GATE, etc

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF2 core this data is for
SV		Square root of the velocity variance
SP		Square root of the position variance
SH		Square root of the height variance
SM		Magnetic field variance
SVT		tilt error convergence metric
errRP		Filtered error in roll/pitch estimate
OFN	m	Most recent position reset (North component)
OFE	m	Most recent position reset (East component)
FS		Filter fault status
TS		Filter timeout status bitmask (0:position measurement, 1:velocity measurement, 2:height measurement, 3:magnetometer measurement, 4:airspeed measurement)
SS	bitmask	Filter solution status
GPS		Filter GPS status
PI		Primary core index

NKF5

EKF2 Sensor innovations (primary core) and general dumping ground

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF2 core this data is for
NI		Normalised flow variance
FIX		Optical flow LOS rate vector innovations from the main nav filter (X-axis)
FIY		Optical flow LOS rate vector innovations from the main nav filter (Y-axis)
AFI		Optical flow LOS rate innovation from terrain offset estimator
HAGL	m	Height above ground level
offset	UNKNOWN	Estimated vertical position of the terrain relative to the nav filter zero datum
RI	UNKNOWN	Range finder innovations
rng	UNKNOWN	Measured range
Herr	m	Filter ground offset state error
eAng	rad	Magnitude of angular error
eVel	m/s	Magnitude of velocity error
ePos	m	Magnitude of position error

NKQ

EKF2 quaternion defining the rotation from NED to XYZ (autopilot) axes

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF2 core this data is for
Q1		Quaternion a term
Q2		Quaternion b term
Q3		Quaternion c term
Q4		Quaternion d term

NKT

EKF2 timing information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF core this message instance applies to
Cnt	s	count of samples used to create this message
IMUMin	s	smallest IMU sample interval
IMUMax	s	largest IMU sample interval
EKFMin	s	low-passed achieved average time step rate for the EKF (minimum)
EKFMax	s	low-passed achieved average time step rate for the EKF (maximum)
AngMin	s	accumulated measurement time interval for the delta angle (minimum)
AngMax	s	accumulated measurement time interval for the delta angle (maximum)
VMin	s	accumulated measurement time interval for the delta velocity (minimum)
VMax	s	accumulated measurement time interval for the delta velocity (maximum)

NKY0

EKF Yaw Estimator States

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF core this data is for
YC	degheading	GSF yaw estimate (deg)
YCS	deg	GSF yaw estimate 1-Sigma uncertainty (deg)
Y0	degheading	Yaw estimate from individual EKF filter 0 (deg)
Y1	degheading	Yaw estimate from individual EKF filter 1 (deg)
Y2	degheading	Yaw estimate from individual EKF filter 2 (deg)
Y3	degheading	Yaw estimate from individual EKF filter 3 (deg)
Y4	degheading	Yaw estimate from individual EKF filter 4 (deg)
W0		Weighting applied to yaw estimate from individual EKF filter 0
W1		Weighting applied to yaw estimate from individual EKF filter 1
W2		Weighting applied to yaw estimate from individual EKF filter 2
W3		Weighting applied to yaw estimate from individual EKF filter 3
W4		Weighting applied to yaw estimate from individual EKF filter 4

NKY1

EKF Yaw Estimator Innovations

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF core this data is for
IVN0	m/s	North velocity innovation from individual EKF filter 0 (m/s)
IVN1	m/s	North velocity innovation from individual EKF filter 1 (m/s)
IVN2	m/s	North velocity innovation from individual EKF filter 2 (m/s)
IVN3	m/s	North velocity innovation from individual EKF filter 3 (m/s)
IVN4	m/s	North velocity innovation from individual EKF filter 4 (m/s)
IVE0	m/s	East velocity innovation from individual EKF filter 0 (m/s)
IVE1	m/s	East velocity innovation from individual EKF filter 1 (m/s)
IVE2	m/s	East velocity innovation from individual EKF filter 2 (m/s)
IVE3	m/s	East velocity innovation from individual EKF filter 3 (m/s)
IVE4	m/s	East velocity innovation from individual EKF filter 4 (m/s)

NTUN

Navigation Tuning information - e.g. vehicle destination

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Dist	m	distance to the current navigation waypoint
TBrg	deg	bearing to the current navigation waypoint
NavBrg	deg	the vehicle's desired heading
AltE	m	difference between current vehicle height and target height
XT	m	the vehicle's current distance from the current travel segment
XTi	cm	integration of the vehicle's crosstrack error
AsE	m/s	difference between vehicle's airspeed and desired airspeed
TLat	deglatitude	target latitude
TLng	deglongitude	target longitude
TAW	m	target altitude WP
TAT	m	target altitude TECS
TAsp	m/s	target airspeed

NVF

Named Value Float messages; messages sent to GCS via NAMED_VALUE_FLOAT

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Name	instance	Name of float
Value		Value of float

OABR

Object avoidance (Bendy Ruler) diagnostics

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Type		Type of BendyRuler currently active
Act		True if Bendy Ruler avoidance is being used
DYaw	deg	Best yaw chosen to avoid obstacle
Yaw	deg	Current vehicle yaw
DP	deg	Desired pitch chosen to avoid obstacle
RChg		True if BendyRuler resisted changing bearing and continued in last calculated bearing
Mar	m	Margin from path to obstacle on best yaw chosen
DLt	deglatitude	Destination latitude
DLg	deglongitude	Destination longitude
DAlt	m	Desired alt above EKF Origin
OLt	deglatitude	Intermediate location chosen for avoidance
OLg	deglongitude	Intermediate location chosen for avoidance
OAlt	m	Intermediate alt chosen for avoidance above EKF origin

OADJ

Object avoidance (Dijkstra) diagnostics

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
State		Dijkstra avoidance library state
Err		Dijkstra library error condition
CurrPoint		Destination point in calculated path to destination
TotPoints		Number of points in path to destination
DLat	deglatitude	Destination latitude
DLng	deglongitude	Destination longitude
OALat	deglatitude	Object Avoidance chosen destination point latitude
OALng	deglongitude	Object Avoidance chosen destination point longitude

OAVG

Object avoidance path planning visgraph points

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
version		Visgraph version, increments each time the visgraph is re-generated
point_num		point number in visgraph
Lat	deglatitude	Latitude
Lon	deglongitude	longitude

OF

Optical flow sensor data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Qual		Estimated sensor data quality
flowX	rad/s	Sensor flow rate, X-axis
flowY	rad/s	Sensor flow rate,Y-axis
bodyX	rad/s	derived rotational velocity, X-axis
bodyY	rad/s	derived rotational velocity, Y-axis

OFCA

Optical Flow Calibration sample

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Axis	instance	Axis (X=0 Y=1)
Num		Sample number
FRate	rad/s	Flow rate
BRate	rad/s	Body rate
LPred	rad/s	Los pred

OFG

OFfboard-Guided - an advanced version of GUIDED for companion computers that includes rate/s.

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Arsp	m/s	target airspeed cm
ArspA	m/s	target airspeed accel
Alt	m	target alt
AltA	m/s/s	target alt velocity (rate of change)
AltF		target alt frame (MAVLink)
Hdg	deg	target heading
HdgA		target heading lim
AltL		target alt frame (Location)

ORGN

Vehicle navigation origin or other notable position

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Type	instance	Position type
Lat	deglatitude	Position latitude
Lng	deglongitude	Position longitude
Alt	m	Position altitude

PARM

parameter value

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Name	char[16]	parameter name
Value		parameter value
Default		default parameter value for this board and config

PIDA

Proportional/Integral/Derivative gain values for vertical acceleration

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Tar		desired value
Act		achieved value
Err		error between target and achieved
P		proportional part of PID
I		integral part of PID
D		derivative part of PID
FF		controller feed-forward portion of response
DFF		controller derivative feed-forward portion of response
Dmod		scaler applied to D gain to reduce limit cycling
SRate		slew rate used in slew limiter
Flags	bitmask	bitmask of PID state flags

PIDE

Proportional/Integral/Derivative gain values for East/West velocity

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Tar		desired value
Act		achieved value
Err		error between target and achieved
P		proportional part of PID
I		integral part of PID
D		derivative part of PID
FF		controller feed-forward portion of response
DFF		controller derivative feed-forward portion of response
Dmod		scaler applied to D gain to reduce limit cycling
SRate		slew rate used in slew limiter
Flags	bitmask	bitmask of PID state flags

PIDG

Plane Proportional/Integral/Derivative gain values for Heading when using COMMAND_INT control.

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Tar		desired value
Act		achieved value
Err		error between target and achieved
P		proportional part of PID
I		integral part of PID
D		derivative part of PID
FF		controller feed-forward portion of response
DFF		controller derivative feed-forward portion of response
Dmod		scaler applied to D gain to reduce limit cycling
SRate		slew rate
Flags	bitmask	bitmask of PID state flags

PIDN

Proportional/Integral/Derivative gain values for North/South velocity

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Tar		desired value
Act		achieved value
Err		error between target and achieved
P		proportional part of PID
I		integral part of PID
D		derivative part of PID
FF		controller feed-forward portion of response
DFF		controller derivative feed-forward portion of response
Dmod		scaler applied to D gain to reduce limit cycling
SRate		slew rate used in slew limiter
Flags	bitmask	bitmask of PID state flags

PIDP

Proportional/Integral/Derivative gain values for Pitch rate

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Tar		desired value
Act		achieved value
Err		error between target and achieved
P		proportional part of PID
I		integral part of PID
D		derivative part of PID
FF		controller feed-forward portion of response
DFF		controller derivative feed-forward portion of response
Dmod		scaler applied to D gain to reduce limit cycling
SRate		slew rate used in slew limiter
Flags	bitmask	bitmask of PID state flags

PIDR

Proportional/Integral/Derivative gain values for Roll rate

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Tar		desired value
Act		achieved value
Err		error between target and achieved
P		proportional part of PID
I		integral part of PID
D		derivative part of PID
FF		controller feed-forward portion of response
DFF		controller derivative feed-forward portion of response
Dmod		scaler applied to D gain to reduce limit cycling
SRate		slew rate used in slew limiter
Flags	bitmask	bitmask of PID state flags

PIDS

Proportional/Integral/Derivative gain values for ground steering yaw rate

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Tar		desired value
Act		achieved value
Err		error between target and achieved
P		proportional part of PID
I		integral part of PID
D		derivative part of PID
FF		controller feed-forward portion of response
DFF		controller derivative feed-forward portion of response
Dmod		scaler applied to D gain to reduce limit cycling
SRate		slew rate used in slew limiter
Flags	bitmask	bitmask of PID state flags

PIDY

Proportional/Integral/Derivative gain values for Yaw rate

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Tar		desired value
Act		achieved value
Err		error between target and achieved
P		proportional part of PID
I		integral part of PID
D		derivative part of PID
FF		controller feed-forward portion of response
DFF		controller derivative feed-forward portion of response
Dmod		scaler applied to D gain to reduce limit cycling
SRate		slew rate used in slew limiter
Flags	bitmask	bitmask of PID state flags

PIQA

QuadPlane Proportional/Integral/Derivative gain values for vertical acceleration

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Tar		desired value
Act		achieved value
Err		error between target and achieved
P		proportional part of PID
I		integral part of PID
D		derivative part of PID
FF		controller feed-forward portion of response
DFF		controller derivative feed-forward portion of response
Dmod		scaler applied to D gain to reduce limit cycling
SRate		slew rate
Flags	bitmask	bitmask of PID state flags

PIQP

QuadPlane Proportional/Integral/Derivative gain values for Pitch rate

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Tar		desired value
Act		achieved value
Err		error between target and achieved
P		proportional part of PID
I		integral part of PID
D		derivative part of PID
FF		controller feed-forward portion of response
DFF		controller derivative feed-forward portion of response
Dmod		scaler applied to D gain to reduce limit cycling
SRate		slew rate
Flags	bitmask	bitmask of PID state flags

PIQR

QuadPlane Proportional/Integral/Derivative gain values for Roll rate

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Tar		desired value
Act		achieved value
Err		error between target and achieved
P		proportional part of PID
I		integral part of PID
D		derivative part of PID
FF		controller feed-forward portion of response
DFF		controller derivative feed-forward portion of response
Dmod		scaler applied to D gain to reduce limit cycling
SRate		slew rate
Flags	bitmask	bitmask of PID state flags

PIQY

QuadPlane Proportional/Integral/Derivative gain values for Yaw rate

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Tar		desired value
Act		achieved value
Err		error between target and achieved
P		proportional part of PID
I		integral part of PID
D		derivative part of PID
FF		controller feed-forward portion of response
DFF		controller derivative feed-forward portion of response
Dmod		scaler applied to D gain to reduce limit cycling
SRate		slew rate
Flags	bitmask	bitmask of PID state flags

PL

Precision Landing messages

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Heal		True if Precision Landing is healthy
TAcq		True if landing target is detected
pX	cm	Target position relative to vehicle, X-Axis (0 if target not found)
pY	cm	Target position relative to vehicle, Y-Axis (0 if target not found)
vX	cm/s	Target velocity relative to vehicle, X-Axis (0 if target not found)
vY	cm/s	Target velocity relative to vehicle, Y-Axis (0 if target not found)
mX	cm	Target's relative to origin position as 3-D Vector, X-Axis
mY	cm	Target's relative to origin position as 3-D Vector, Y-Axis
mZ	cm	Target's relative to origin position as 3-D Vector, Z-Axis
LastMeasMS	ms	Time when target was last detected
EKFOutl		EKF's outlier count
Est		Type of estimator used

PM

autopilot system performance and general data dumping ground

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
LR	Hz	Main loop rate
NLon		Number of long loops detected
NL		Number of measurement loops for this message
MaxT		Maximum loop time
Mem	B	Free memory available
Load	d%	System processor load
InE	bitmask	Internal error mask; which internal errors have been detected
ErrL		Internal error line number; last line number on which a internal error was detected
ErC		Internal error count; how many internal errors have been detected
SPIC		Number of SPI transactions processed
I2CC		Number of i2c transactions processed
I2CI		Number of i2c interrupts serviced
Ex	μs	number of microseconds being added to each loop to address scheduler overruns
R	μs	RTC time, time since Unix epoch

POS

Canonical vehicle position

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Lat	deglatitude	Canonical vehicle latitude
Lng	deglongitude	Canonical vehicle longitude
Alt	m	Canonical vehicle altitude
RelHomeAlt	m	Canonical vehicle altitude relative to home
RelOriginAlt	m	Canonical vehicle altitude relative to navigation origin

POWR

System power information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Vcc	V	Flight board voltage
VServo	V	Servo rail voltage
Flags	bitmask	System power flags
AccFlags	bitmask	Accumulated System power flags; all flags which have ever been set
Safety		Hardware Safety Switch status

PRTN

Plane Parameter Tuning data

FieldName	Units/Type	Description
TimeUS		Time since system startup
Set		Parameter set being tuned
Parm		Parameter being tuned
Value		Current parameter value
CenterValue		Center value (startpoint of current modifications) of parameter being tuned

PRX

Proximity Filtered sensor data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Layer	instance	Pitch(instance) at which the obstacle is at. 0th layer {-75,-45} degrees. 1st layer {-45,-15} degrees. 2nd layer {-15, 15} degrees. 3rd layer {15, 45} degrees. 4th layer {45,75} degrees. Minimum distance in each layer will be logged.
He		True if proximity sensor is healthy
D0	m	Nearest object in sector surrounding 0-degrees
D45	m	Nearest object in sector surrounding 45-degrees
D90	m	Nearest object in sector surrounding 90-degrees
D135	m	Nearest object in sector surrounding 135-degrees
D180	m	Nearest object in sector surrounding 180-degrees
D225	m	Nearest object in sector surrounding 225-degrees
D270	m	Nearest object in sector surrounding 270-degrees
D315	m	Nearest object in sector surrounding 315-degrees
DUp	m	Nearest object in upwards direction
CAn	degheading	Angle to closest object
CDis	m	Distance to closest object

PRXR

Proximity Raw sensor data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Layer	instance	Pitch(instance) at which the obstacle is at. 0th layer {-75,-45} degrees. 1st layer {-45,-15} degrees. 2nd layer {-15, 15} degrees. 3rd layer {15, 45} degrees. 4th layer {45,75} degrees. Minimum distance in each layer will be logged.
D0	m	Nearest object in sector surrounding 0-degrees
D45	m	Nearest object in sector surrounding 45-degrees
D90	m	Nearest object in sector surrounding 90-degrees
D135	m	Nearest object in sector surrounding 135-degrees
D180	m	Nearest object in sector surrounding 180-degrees
D225	m	Nearest object in sector surrounding 225-degrees
D270	m	Nearest object in sector surrounding 270-degrees
D315	m	Nearest object in sector surrounding 315-degrees

PSCD

Position Control Down

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
DPD	m	Desired position relative to EKF origin + Offsets
TPD	m	Target position relative to EKF origin
PD	m	Position relative to EKF origin
DVD	m/s	Desired velocity Down
TVD	m/s	Target velocity Down
VD	m/s	Velocity Down
DAD	m/s/s	Desired acceleration Down
TAD	m/s/s	Target acceleration Down
AD	m/s/s	Acceleration Down

PSCE

Position Control East

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
DPE	m	Desired position relative to EKF origin + Offsets
TPE	m	Target position relative to EKF origin
PE	m	Position relative to EKF origin
DVE	m/s	Desired velocity East
TVE	m/s	Target velocity East
VE	m/s	Velocity East
DAE	m/s/s	Desired acceleration East
TAE	m/s/s	Target acceleration East
AE	m/s/s	Acceleration East

PSCN

Position Control North

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
DPN	m	Desired position relative to EKF origin
TPN	m	Target position relative to EKF origin
PN	m	Position relative to EKF origin
DVN	m/s	Desired velocity North
TVN	m/s	Target velocity North
VN	m/s	Velocity North
DAN	m/s/s	Desired acceleration North
TAN	m/s/s	Target acceleration North
AN	m/s/s	Acceleration North

PSOD

Position Control Offsets Down

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
TPOD	m	Target position offset Down
POD	m	Position offset Down
TVOD	m/s	Target velocity offset Down
VOD	m/s	Velocity offset Down
TAOD	m/s/s	Target acceleration offset Down
AOD	m/s/s	Acceleration offset Down

PSOE

Position Control Offsets East

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
TPOE	m	Target position offset East
POE	m	Position offset East
TVOE	m/s	Target velocity offset East
VOE	m/s	Velocity offset East
TAOE	m/s/s	Target acceleration offset East
AOE	m/s/s	Acceleration offset East

PSON

Position Control Offsets North

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
TPON	m	Target position offset North
PON	m	Position offset North
TVON	m/s	Target velocity offset North
VON	m/s	Velocity offset North
TAON	m/s/s	Target acceleration offset North
AON	m/s/s	Acceleration offset North

PSOT

Position Control Offsets Terrain (Down)

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
TPOT	m	Target position offset Terrain
POT	m	Position offset Terrain
TVOT	m/s	Target velocity offset Terrain
VOT	m/s	Velocity offset Terrain
TAOT	m/s/s	Target acceleration offset Terrain
AOT	m/s/s	Acceleration offset Terrain

QBRK

Quadplane Braking

FieldName	Units/Type	Description
TimeUS		Time since system startup
SpdScaler		braking speed scaler
NPULCD		upper limit for navigation pitch
QBPLCD		upper limit for back transition pitch
NPCD		demanded navigation pitch

QPOS

Quadplane position data

FieldName	Units/Type	Description
TimeUS		Time since system startup
State	enum	Position control state
Dist		Distance to next waypoint
TSpd		Target speed
TAcc		Target acceleration
OShoot		True if landing point is overshot or heading off by more than 60 degrees

QTUN

QuadPlane vertical tuning message

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
ThI		throttle input
ABst		angle boost
ThO		throttle output
ThH		calculated hover throttle
DAlt	m	desired altitude
Alt	m	achieved altitude
BAlt	m	barometric altitude
DCRt	m/s	desired climb rate
CRt	m/s	climb rate
TMix		transition throttle mix value
Trn		Transition state: 0-AirspeedWait,1-Timer,2-Done / TailSitter: 0-FW Wait,1-VTOL Wait,2-Done
Ast	bitmask	bitmask of assistance flags

QWIK

Quicktune

FieldName	Units/Type	Description
TimeUS	s	Time since system startup
ParamNo	instance	number of parameter being tuned
SRate		slew rate
Gain		test gain for current axis and PID element
Param	char[16]	name of parameter being being tuned

RAD

Telemetry radio statistics

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
RSSI		RSSI
RemRSSI		RSSI reported from remote radio
TxBuf		number of bytes in radio ready to be sent
Noise		local noise floor
RemNoise		local noise floor reported from remote radio
RxErrors		damaged packet count
Fixed		fixed damaged packet count

RALY

Rally point information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Tot		total number of rally points onboard
Seq		this rally point's sequence number
Lat	deglatitude	latitude of rally point
Lng	deglongitude	longitude of rally point
Alt	cm	altitude of rally point
Flags		altitude frame flags

RASH

Replay Airspeed Sensor Header

FieldName	Units/Type	Description
Primary		airspeed instance number
NumInst		number of airspeed instances

RASI

Replay Airspeed Sensor Instance data

FieldName	Units/Type	Description
pd		measured airspeed
UpdateMS		timestamp of measured airspeed
H		indicator of airspeed sensor health
Use		true if airspeed is configured to be used
I	instance	airspeed instance number

RATE

Desired and achieved vehicle attitude rates. Not logged in Fixed Wing Plane modes.

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
RDes	deg/s	vehicle desired roll rate
R	deg/s	achieved vehicle roll rate
ROut		normalized output for Roll
PDes	deg/s	vehicle desired pitch rate
P	deg/s	vehicle pitch rate
POut		normalized output for Pitch
Y	deg/s	achieved vehicle yaw rate
YOut	deg/s	normalized output for Yaw
YDes		vehicle desired yaw rate
ADes	cm/s/s	desired vehicle vertical acceleration
A	cm/s/s	achieved vehicle vertical acceleration
AOut		percentage of vertical thrust output current being used
AOutSlew		vertical thrust output slew rate

RBCH

Replay Data Beacon Header

FieldName	Units/Type	Description
PX		zero, unused
PY		zero, unused
PZ		zero, unused
AE		zero, unused
OLat		origin latitude
OLng		origin longitude
OAlt		origin altitude
Flags		vehicle_position_ned_returncode,get_origin_returncode,enabled
NumInst		number of beacons

RBCI

Replay Data Beacon Instance

FieldName	Units/Type	Description
LU	s	last update from this beacon instance
PX	m	beacon distance from origin, X-axis
PY	m	beacon distance from origin, Y-axis
PZ	m	beacon distance from origin, Z-axis
Dist	m	distance to beacon
H		beacon data health
I	instance	beacon instance number

RBOH

Replay body odometry data

FieldName	Units/Type	Description
Q		data quality measure
DPX		delta-position-X
DPY		delta-position-Y
DPZ		delta-position-Z
DAX		delta-angle-X
DAY		delta-angle-Y
DAZ		delta-angle-Z
DT		delta-time
TS		data timestamp
OX		zero, unused
OY		zero, unused
OZ		zero, unused
D		zero, unused

RBRH

Replay Data Barometer Header

FieldName	Units/Type	Description
Primary		primary barometer instance number
NumInst		number of barometer sensors

RBRI

Replay Data Barometer Instance

FieldName	Units/Type	Description
LastUpdate		timestamp of barometer data
Alt		barometer altitude estimate
H		barometer sensor health indication
I	instance	barometer instance number

RCDA

Raw RC data

FieldName	Units/Type	Description
TimeUS		Time since system startup
TS		data arrival timestamp
Prot		Protocol currently being decoded
Len		Number of valid bytes in message
U0		first quartet of bytes
U1		second quartet of bytes
U2		third quartet of bytes
U3		fourth quartet of bytes
U4		fifth quartet of bytes
U5		sixth quartet of bytes
U6		seventh quartet of bytes
U7		eight quartet of bytes
U8		ninth quartet of bytes
U9		tenth quartet of bytes

RCI2

(More) RC input channels to vehicle

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C15	us	channel 15 input
C16	us	channel 16 input
OMask		bitmask of RC channels being overridden by mavlink input
Flags	bitmask	bitmask of RC state flags

RCIN

RC input channels to vehicle

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C1	us	channel 1 input
C2	us	channel 2 input
C3	us	channel 3 input
C4	us	channel 4 input
C5	us	channel 5 input
C6	us	channel 6 input
C7	us	channel 7 input
C8	us	channel 8 input
C9	us	channel 9 input
C10	us	channel 10 input
C11	us	channel 11 input
C12	us	channel 12 input
C13	us	channel 13 input
C14	us	channel 14 input

RCO2

Servo channel output values 15 to 18

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C15	us	channel 15 output
C16	us	channel 16 output
C17	us	channel 17 output
C18	us	channel 18 output

RCO3

Servo channel output values 19 to 32

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C19	us	channel 19 output
C20	us	channel 20 output
C21	us	channel 21 output
C22	us	channel 22 output
C23	us	channel 23 output
C24	us	channel 24 output
C25	us	channel 25 output
C26	us	channel 26 output
C27	us	channel 27 output
C28	us	channel 28 output
C29	us	channel 29 output
C30	us	channel 30 output
C31	us	channel 31 output
C32	us	channel 32 output

RCOU

Servo channel output values 1 to 14

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C1	us	channel 1 output
C2	us	channel 2 output
C3	us	channel 3 output
C4	us	channel 4 output
C5	us	channel 5 output
C6	us	channel 6 output
C7	us	channel 7 output
C8	us	channel 8 output
C9	us	channel 9 output
C10	us	channel 10 output
C11	us	channel 11 output
C12	us	channel 12 output
C13	us	channel 13 output
C14	us	channel 14 output

RELY

Relay state

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Instance	instance	relay instance number
State		current state

REPH

Replay external position data

FieldName	Units/Type	Description
PX		external position estimate, X-axis
PY		external position estimate, Y-axis
PZ		external position estimate, Z-axis
Q1		external attitude quaternion
Q2		external attitude quaternion
Q3		external attitude quaternion
Q4		external attitude quaternion
PEr		external position error estimate
AEr		external attitude error estimate
TS		timestamp on external error estimate
RT		timestamp of last external reset
D		delay on external data

REV2

Replay Event (EKF2)

FieldName	Units/Type	Description
Event	enum	external event injected into EKF

REV3

Replay Event (EKF3)

FieldName	Units/Type	Description
Event	enum	external event injected into EKF

REVH

Replay external velocity data

FieldName	Units/Type	Description
VX		external velocity estimate, X-axis
VY		external velocity estimate, Y-axis
VZ		external velocity estimate, Z-axis
Er		error in velocity estimate
TS		timestamp of velocity estimate
D		delay in external velocity data

REY3

Replay Euler Yaw event

FieldName	Units/Type	Description
yawangle	UNKNOWN	externally supplied yaw angle
yawangleerr	UNKNOWN	error in externally supplied yaw angle
timestamp_ms	UNKNOWN	timestamp associated with yaw angle and yaw angle error
type		number that needs documenting

RFND

Rangefinder sensor information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Instance	instance	rangefinder instance number this data is from
Dist	m	Reported distance from sensor
Stat	enum	Sensor state
Orient	enum	Sensor orientation
Quality	%	Signal quality. -1 means invalid, 0 is no signal, 100 is perfect signal

RFRF

Replay FRame data - Finished frame

FieldName	Units/Type	Description
FTypes	bitmask	accumulated method calls made during frame
Slow		true if we are not keeping up with IMU loop rate

RFRH

Replay FRame Header

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
TF		Time flying

RFRN

Replay FRame - aNother frame header

FieldName	Units/Type	Description
HLat	1e-7 deglatitude	home latitude
HLon	1e-7 deglongitude	home latitude
HAlt	cm	home altitude AMSL
E2T		EAS to TAS factor
AM	B	available memory
TX	deg	AHRS trim X
TY	deg	AHRS trim Y
TZ	deg	AHRS trim Z
VC		AHRS Vehicle Class
EKT	enum	configured EKF type
Flags	bitmask	bitmask of boolean state

RGPH

Replay Data GPS Header

FieldName	Units/Type	Description
NumInst		number of GPS sensors
Primary		instance number of primary sensor

RGPI

Replay Data GPS Instance, infrequently changing data

FieldName	Units/Type	Description
OX		antenna body-frame offset, X-axis
OY		antenna body-frame offset, Y-axis
OZ		antenna body-frame offset, Z-axis
Lg		GPS time lag
Flags	bitmask	various GPS flags
Stat		GPS fix status
NSats		number of satellites GPS is using
I	instance	GPS sensor instance number

RGPJ

Replay Data GPS Instance - rapidly changing data

FieldName	Units/Type	Description
TS		GPS data timestamp
VX		GPS velocity, North
VY		GPS velocity, East
VZ		GPS velocity, Down
SA		speed accuracy
Y		GPS yaw
YA		GPS yaw accuracy
YT		timestamp of GPS yaw estimate
Lat		latitude
Lon		longitude
Alt		altitude
HA		horizontal accuracy
VA		vertical accuracy
HD		HDOP
I	instance	GPS sensor instance number

RICH

Richenpower generator telemetry

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
runTime		total generator runtime
maintTime		time until generator requires maintenance
errors		bitmask of error received from generator
rpm		current generator RPM
ovolt		output voltage
ocurr		output current
mode		generator mode; idle/run/charge/balance

RISH

Replay Inertial Sensor header

FieldName	Units/Type	Description
LR		INS loop rate
PG		primary gyro index
PA		primary accel index
LD		INS loop-delta-t
AC		accel count
GC		gyro count

RISI

Replay Inertial Sensor instance data

FieldName	Units/Type	Description
DVX		x-axis delta-velocity
DVY		y-axis delta-velocity
DVZ		z-axis delta-velocity
DAX		x-axis delta-angle
DAY		y-axis delta-angle
DAZ		z-axis delta-angle
DVDT		delta-velocity-delta-time
DADT		delta-angle-delta-time
Flags		use-accel, use-gyro, delta-vel-valid, delta-accel-valid
I	instance	IMU instance

RMGH

Replay Data Magnetometer Header

FieldName	Units/Type	Description
Dec		vehicle declination
Avail		true if the compass library is marking itself as available
NumInst		number of compass instances
AutoDec		true if compass autodeclination is enabled
NumEna		number of enabled compass instances
LOE		true if compass learning of offsets is enabled
C		true if compasses are consistent
FUsable		index of first usable compass

RMGI

Replay Data Magnetometer Instance

FieldName	Units/Type	Description
LU		last update time for magnetometer data
OX		mag sensor offset, X-axis
OY		mag sensor offset, Y-axis
OZ		mag sensor offset, Z-axis
FX		field strength, X-axis
FY		field strength, Y-axis
FZ		field strength, Z-axis
UFY		true if compass is being used for yaw
H		sensor health
HSF		compass has scale factor
I	instance	magnetometer instance number

ROFH

Replay optical flow data

FieldName	Units/Type	Description
FX		raw flow rate, X-axis
FY		raw flow rate, Y-axis
GX		gyro rate, X-axis
GY		gyro rate, Y-axis
Tms		measurement timestamp
PX		gyro rate, X-axis
PY		body-frame offset, Y-axis
PZ		body-frame offset, Z-axis
HgtOvr		sensor height override
Qual		flow quality measurement

RPM

Data from RPM sensors

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
I	instance	Instance
RPM	rpm	Sensor's rpm measurement
Qual		Signal quality
H		Sensor Health (Bool)

RRNH

Replay Data Rangefinder Header

FieldName	Units/Type	Description
GCl	m	rangefinder ground clearance for downward-facing rangefinders
MaxD	m	rangefinder maximum distance for downward-facing rangefinders
NumSensors		number of rangefinder instances

RRNI

Replay Data Rangefinder Instance

FieldName	Units/Type	Description
PX		rangefinder body-frame offset, X-axis
PY		rangefinder body-frame offset, Y-axis
PZ		rangefinder body-frame offset, Z-axis
Dist	m	Measured rangefinder distance
Orient		orientation
Status		status
I	instance	rangefinder instance number

RSLL

Replay Set Lat Lng event

FieldName	Units/Type	Description
Lat	1e-7 deglatitude	latitude
Lng	1e-7 deglongitude	longitude
PosAccSD		position accuracy, 1-StD
TS		timestamp of latitude/longitude

RSO2

Replay Set Origin event (EKF2)

FieldName	Units/Type	Description
Lat	1e-7 deglatitude	origin latitude
Lon	1e-7 deglongitude	origin longitude
Alt	cm	origin altitude

RSO3

Replay Set Origin event (EKF3)

FieldName	Units/Type	Description
Lat	1e-7 deglatitude	origin latitude
Lon	1e-7 deglongitude	origin longitude
Alt	cm	origin altitude

RSSI

Received Signal Strength Indicator for RC receiver

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
RXRSSI		RSSI
RXLQ	%	RX Link Quality

RTC

Information about RTC clock resets

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
old_utc	μs	old time
new_utc	μs	new time

RTCM

GPS atmospheric perturbation data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Chan	instance	mavlink channel number this data was received on
RTCMId		ID field from RTCM packet
Len		RTCM packet length
CRC		calculated crc32 for the packet

RVOH

Replay Data Visual Odometry data

FieldName	Units/Type	Description
OX		offset, x-axis
OY		offset, y-axis
OZ		offset, z-axis
Del		data delay
H		sensor health
Ena		sensor enabled

RWA2

Replay set-default-airspeed event (EKF2)

FieldName	Units/Type	Description
Airspeed	m/s	default airspeed
uncertainty	m/s	uncertainty in default airspeed

RWA3

Replay set-default-airspeed event (EKF3)

FieldName	Units/Type	Description
Airspeed	m/s	default airspeed
Uncertainty	m/s	uncertainty in default airspeed

RWOH

Replay wheel odometry data

FieldName	Units/Type	Description
DA		delta-angle
DT		delta-time
TS		data timestamp
PX		sensor body-frame offset, x-axis
PY		sensor body-frame offset, y-axis
PZ		sensor body-frame offset, z-axis
R		wheel radius

SA

Simple Avoidance messages

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
State		True if Simple Avoidance is active
DVelX	m/s	Desired velocity, X-Axis (Velocity before Avoidance)
DVelY	m/s	Desired velocity, Y-Axis (Velocity before Avoidance)
DVelZ	m/s	Desired velocity, Z-Axis (Velocity before Avoidance)
MVelX	m/s	Modified velocity, X-Axis (Velocity after Avoidance)
MVelY	m/s	Modified velocity, Y-Axis (Velocity after Avoidance)
MVelZ	m/s	Modified velocity, Z-Axis (Velocity after Avoidance)
Back		True if vehicle is backing away

SAF1

Simulated Blimp Sin-Angles

FieldName	Units/Type	Description
TimeUS		Time since system startup
afx		sin(x angle)
afy		sin(y angle)
afz		sin(z angle)

SAN1

Simulated Blimp Angles

FieldName	Units/Type	Description
TimeUS		Time since system startup
anx		x angle
any		y angle
anz		z angle

SAN2

Simulated Blimp Angles

FieldName	Units/Type	Description
TimeUS		Time since system startup
anx		x earth-frame angle
any		y earth-frame angle
anz		z earth-frame angle

SBA1

Simulated Blimp Body-Frame accelerations

FieldName	Units/Type	Description
TimeUS		Time since system startup
ax		x-axis acceleration
ay		y-axis acceleration
az		z-axis acceleration

SBLM

Simulated Blimp Rotational Accelerations

FieldName	Units/Type	Description
TimeUS		Time since system startup
RAx		acceleration around X axis
RAy		acceleration around Y axis
RAz		acceleration around Z axis

SBPH

Swift Health Data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
CrcError		Number of packet CRC errors on serial connection
LastInject		Timestamp of last raw data injection to GPS
IARhyp		Current number of integer ambiguity hypotheses

SBRE

Swift Time Data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
GWk	UNKNOWN	GPS week number
GMS	UNKNOWN	Milliseconds through GPS week
ns_residual	UNKNOWN	residual of milliseconds rounding in ns
level	UNKNOWN	GPIO pin levels
quality	UNKNOWN	time quality

SCR

Scripting runtime stats

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Name	instance	script name
Runtime	μs	run time
Total_mem	B	total memory usage of all scripts
Run_mem	B	run memory usage

SCTL

Simulated Glider Drop control outputs

FieldName	Units/Type	Description
TimeUS		Time since system startup
Ail		aileron output
Elev		elevator output
Rudd		rudder output

SCVE

Debug message for SCurve internal error

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Sm		duration of the raised cosine jerk profile
Jm		maximum value of the raised cosine jerk profile
V0		initial velocity magnitude
Am		maximum constant acceleration
Vm		maximum constant velocity
L		Length of the path
Jm_out		maximum value of the raised cosine jerk profile
tj_out		segment duration
t2_out		segment duration
t4_out		segment duration
t6_out		segment duration

SFA1

Simulated Blimp Fin Angles

FieldName	Units/Type	Description
TimeUS		Time since system startup
f0		fin 0 angle
f1		fin 1 angle
f2		fin 2 angle
f3		fin 3 angle

SFAN

Simulated Blimp Servo Angles

FieldName	Units/Type	Description
TimeUS		Time since system startup
f0		fin 0 servo angle
f1		fin 1 servo angle
f2		fin 2 servo angle
f3		fin 3 servo angle

SFN

Simulated Blimp Fin Forces

FieldName	Units/Type	Description
TimeUS		Time since system startup
n0		Fin 0 normal force
n1		Fin 1 normal force
n2		Fin 2 normal force
n3		Fin 3 normal force

SFT

Simulated Blimp Fin Thrust

FieldName	Units/Type	Description
TimeUS		Time since system startup
f0		Fin 0 tangential thrust
f1		Fin 1 tangential thrust
f2		Fin 2 tangential thrust
f3		Fin 3 tangential thrust

SFV1

Simulated Blimp Fin Velocities

FieldName	Units/Type	Description
TimeUS		Time since system startup
f0		fin 0 velocity
f1		fin 1 velocity
f2		fin 2 velocity
f3		fin 3 velocity

SIDD

System ID data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Time	s	Time reference for waveform
Targ		Current waveform sample
F	Hz	Instantaneous waveform frequency
Gx	deg/s	Delta angle, X-Axis
Gy	deg/s	Delta angle, Y-Axis
Gz	deg/s	Delta angle, Z-Axis
Ax	m/s/s	Delta velocity, X-Axis
Ay	m/s/s	Delta velocity, Y-Axis
Az	m/s/s	Delta velocity, Z-Axis

SIDS

System ID settings

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Ax		The axis which is being excited
Mag		Magnitude of the chirp waveform
FSt	s	Frequency at the start of chirp
FSp	s	Frequency at the end of chirp
TFin	s	Time to reach maximum amplitude of chirp
TC	s	Time at constant frequency before chirp starts
TR	s	Time taken to complete chirp waveform
TFout	s	Time to reach zero amplitude after chirp finishes

SIM

SITL simulator state

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Roll	deg	Simulated roll
Pitch	deg	Simulated pitch
Yaw	degheading	Simulated yaw
Alt	m	Simulated altitude
Lat	deglatitude	Simulated latitude
Lng	deglongitude	Simulated longitude
Q1		Attitude quaternion component 1
Q2		Attitude quaternion component 2
Q3		Attitude quaternion component 3
Q4		Attitude quaternion component 4

SIM2

Additional simulator state

FieldName	Units/Type	Description
TimeUS		Time since system startup
PN		North position from home
PE		East position from home
PD		Down position from home
VN		Velocity north
VE		Velocity east
VD		Velocity down
As		Airspeed
ASpdU		Achieved simulation speedup value
UFC		Number of times simulation paused for serial0 output

SITL

Simulation data

FieldName	Units/Type	Description
TimeUS		Time since system startup
VN		Velocity - North component
VE		Velocity - East component
VD		Velocity - Down component
AN		Acceleration - North component
AE		Acceleration - East component
AD		Acceleration - Down component
PN		Position - North component
PE		Position - East component
PD		Position - Down component

SL2

More Simulated Glider Dropped Calculations

FieldName	Units/Type	Description
TimeUS		Time since system startup
AltFt		altitude in feet
KEAS		equivalent airspeed in knots
KTAS		true airspeed in knots
AD		air density
Fl		lift
Fd		drag
LD		lift/drag ratio
Elev		elevator output
Ail		aileron output
Rud		rudder output
AoA		Angle of Attack
SSA		Side Slip Angle
q		air pressire
Az		z-axis body-frame acceleration

SLD

Simulated Glider Dropped Calculations

FieldName	Units/Type	Description
TimeUS		Time since system startup
AltFt		altitude in feet
AltM		altitude in metres
EAS		equivalent airspeed
TAS		true airspeed
AD		air density
Fl		lift
Fd		drag
LD		lift/drag ratio
Elev		elevator output
AoA		angle of attack
Fx		X-axis force
Fy		Y-axis force
Fz		Z-axis force
q		air pressure

SLUP

Slung payload

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Land		1 if payload is landed, 0 otherwise
Tens	1e2 %	Tension ratio, 1 if line is taut, 0 if slack
Len	m	Line length
PN	m	Payload position as offset from vehicle in North direction
PE	m	Payload position as offset from vehicle in East direction
PD	m	Payload position as offset from vehicle in Down direction
VN	m/s	Payload velocity in North direction
VE	m/s	Payload velocity in East direction
VD	m/s	Payload velocity in Down direction
AN	m/s/s	Payload acceleration in North direction
AE	m/s/s	Payload acceleration in East direction
AD	m/s/s	Payload acceleration in Down direction
VFN		Force on vehicle in North direction
VFE		Force on vehicle in East direction
VFD		Force on vehicle in Down direction

SLV1

Log data received from JSON simulator 1

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup (us)
Instance	instance	Slave instance
magic		magic JSON protocol key
frame_rate		Slave instance's desired frame rate
frame_count		Slave instance's current frame count
active		1 if the servo outputs are being used from this instance

SLV2

Log data received from JSON simulator 2

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Instance	instance	Slave instance
C1	us	channel 1 output
C2	us	channel 2 output
C3	us	channel 3 output
C4	us	channel 4 output
C5	us	channel 5 output
C6	us	channel 6 output
C7	us	channel 7 output
C8	us	channel 8 output
C9	us	channel 9 output
C10	us	channel 10 output
C11	us	channel 11 output
C12	us	channel 12 output
C13	us	channel 13 output
C14	us	channel 14 output

SMGC

Simulated Blimp Mass and COG

FieldName	Units/Type	Description
TimeUS		Time since system startup
m		mass
g		gravity
cz		centre-of-gravity, z-axis

SMOO

Smoothed sensor data fed to EKF to avoid inconsistencies

FieldName	Units/Type	Description
TimeUS		Time since system startup
AEx		Angular Velocity (around x-axis)
AEy		Angular Velocity (around y-axis)
AEz		Angular Velocity (around z-axis)
DPx		Velocity (along x-axis)
DPy		Velocity (along y-axis)
DPz		Velocity (along z-axis)
R		Roll
P		Pitch
Y		Yaw
R2		DCM Roll
P2		DCM Pitch
Y2		DCM Yaw

SMVZ

Simulated Volz servo information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Id	instance	Volz servo ID
Pos	%	Current Simulated Position
DesPos	%	Desired Simulated Position
V	V	simulated servo voltage
A	A	simulated servo current
PCBT	degC	simulated PCB Temperature
MotT	degC	simulated motor Temperature

SOAR

More information

Logged data from soaring feature

FieldName	Units/Type	Description
TimeUS		microseconds since system startup
nettorate		Estimate of vertical speed of surrounding airmass
x0		Thermal strength estimate
x1		Thermal radius estimate
x2		Thermal position estimate north from home
x3		Thermal position estimate east from home
north		Aircraft position north from home
east		Aircraft position east from home
alt		Aircraft altitude
dx_w		Wind speed north
dy_w		Wind speed east
th		Estimate of achievable climbrate in thermal

SORC

More information

Soaring Cruise-phase data

FieldName	Units/Type	Description
TimeUS		Time since system startup
wx		body-frame wind estimate, x-axis
wz		body-frame wind estimate, z-axis
wexp		estimated thermal vertical speed
CLmin		expected climb-rate lower-limit
CLmax		expected climb-rate upper-limit
Vopt		calculated optimal speed to fly

SRT1

Simulated Blimp Rotational forces

FieldName	Units/Type	Description
TimeUS		Time since system startup
rtx		zero
rty		zero
rtz		zero

SRT2

Transformed Simulated Blimp Rotational forces

FieldName	Units/Type	Description
TimeUS		Time since system startup
rtx		x-axis wobble rotational force
rty		y-axis wobble rotational force
rtz		z-axis wobble rotational force

SRT3

Simulated Blimp Torques

FieldName	Units/Type	Description
TimeUS		Time since system startup
rtx		torque around x axis
rty		torque around y axis
rtz		torque around z axis

SRTL

SmartRTL statistics

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Active		true if SmartRTL could be used right now
NumPts		number of points currently in use
MaxPts		maximum number of points that could be used
Action	enum	most recent internal action taken by SRTL library
N	m	point associated with most recent action (North component)
E	m	point associated with most recent action (East component)
D	m	point associated with most recent action (Down component)

SSAN

Simulated Blimp Servo Inputs

FieldName	Units/Type	Description
TimeUS		Time since system startup
f0		fin 0 servo angle input
f1		fin 1 servo angle input
f2		fin 2 servo angle input
f3		fin 3 servo angle input

STAK

Stack information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Id	instance	thread ID
Pri		thread priority
Total		total stack
Free		free stack
Name	char[16]	thread name

STAT

Current status of the aircraft

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
isFlying		True if aircraft is probably flying
isFlyProb		Probability that the aircraft is flying
Armed		Arm status of the aircraft
Safety		State of the safety switch
Crash		True if crash is detected
Still		True when vehicle is not moving in any axis
Stage		Current stage of the flight
Hit		True if impact is detected
Sup		True if throttle is suppressed

SWSH

Helicopter swashplate logging

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
I	instance	Swashplate instance
Col	deg	Blade pitch angle contribution from collective
TCyc	deg	Total blade pitch angle contribution from cyclic
PCyc	deg	Blade pitch angle contribution from pitch cyclic
RCyc	deg	Blade pitch angle contribution from roll cyclic

TCLR

Temperature Calibration Information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
I	instance	temperature calibration instance number
SType		sensor type (0==accel, 1==gyro)
Temp		current temperature
X		x-axis sample sum
Y		y-axis sample sum
Z		z-axis sample sum
NSamp		sample count

TEC2

More information

Additional information about the Total Energy Control System

FieldName	Units/Type	Description
TimeUS		Time since system startup
PEW		Potential energy weighting
KEW		Kinetic energy weighting
EBD		Energy balance demand
EBE		Energy balance estimate
EBDD		Energy balance rate demand
EBDE		Energy balance rate estimate
EBDDT		Energy balance rate demand + Energy balance rate error*pitch_damping
Imin		Minimum integrator value
Imax		Maximum integrator value
I		Energy balance error integral
KI		Pitch demand kinetic energy integral
tmin		Throttle min
tmax		Throttle max

TEC3

More information

Additional additional information about the Total Energy Control System

FieldName	Units/Type	Description
TimeUS		Time since system startup
KED		Kinetic Energy Dot (1st derivative of KE)
PED		Potential Energy Dot (1st derivative of PE)
KEDD		Kinetic Energy Dot Demand
PEDD		Potential Energy Dot Demand
TEE		Total energy error
TEDE		Total energy dot error (1st derivative of total energy error)
FFT		feed-forward throttle
Imin		integrator limit based on throttle values
Imax		integrator limit based on throttle values
I		integrator state for throttle
Emin		lower limit for potential energy error
Emax		upper limit for potential energy error

TEC4

More information

Additional additional additional information about the Total Energy Control System

FieldName	Units/Type	Description
TimeUS		Time since system startup
P		estimate of potential energy
K		estimate of kinetic energy
Pdem		demanded potential energy
Kdem		demanded kinetic energy

TECS

More information

Information about the Total Energy Control System

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
h	m	height estimate (UP) currently in use by TECS
dh	m/s	current climb rate ("delta-height")
hin	m	height demand received by TECS
hdem	m	height demand after rate limiting and filtering that TECS is currently trying to achieve
dhdem	m/s	climb rate TECS is currently trying to achieve
spdem	m/s	True AirSpeed TECS is currently trying to achieve
sp	m/s	current estimated True AirSpeed
dsp	m/s	x-axis acceleration estimate ("delta-speed")
th		throttle output
ph		pitch output
pmin		pitch lower limit
pmax		pitch upper limit
dspdem		demanded acceleration output ("delta-speed demand")
f	bitmask	flags

TEMP

Temperature Sensor Data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Instance	instance	temperature sensor instance
Temp	degC	temperature

TERR

Terrain database information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Status	enum	Terrain database status
Lat	deglatitude	Current vehicle latitude
Lng	deglongitude	Current vehicle longitude
Spacing		terrain Tile spacing
TerrH	m	current Terrain height
CHeight	m	Vehicle height above terrain
Pending		Number of tile requests outstanding
Loaded		Number of tiles in memory
ROfs	m	terrain reference offset for arming altitude

TETH

Tether state

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Len		Tether length
VFN		Force on vehicle in North direction
VFE		Force on vehicle in East direction
VFD		Force on vehicle in Down direction

TILT

Tiltrotor tilt values

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Tilt	deg	Current tilt angle, 0 deg vertical, 90 deg horizontal
FL	deg	Front left tilt angle, 0 deg vertical, 90 deg horizontal
FR	deg	Front right tilt angle, 0 deg vertical, 90 deg horizontal

TRIG

Camera shutter information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
I	instance	Instance number
Img		Image number
GPSTime		milliseconds since start of GPS week
GPSWeek		weeks since 5 Jan 1980
Lat	deglatitude	current latitude
Lng	deglongitude	current longitude
Alt	m	current altitude
RelAlt	m	current altitude relative to home
GPSAlt	m	altitude as reported by GPS
R	deg	current vehicle roll
P	deg	current vehicle pitch
Y	deg	current vehicle yaw

TRMP

Torqeedo Motor Param

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
I	instance	instance
RPM	rpm	Motor RPM
Pow	Watt	Motor power
Volt	V	Motor voltage
Cur	A	Motor current
ETemp	degC	ESC Temp
MTemp	degC	Motor Temp

TRMS

Torqeedo Motor Status

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
I	instance	instance
State		Motor status flags
Err		Motor error flags

TRQD

Torqeedo Status

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
I	instance	instance
Health		Health
DesMotSpeed		Desired Motor Speed (-1000 to 1000)
MotSpeed		Motor Speed (-1000 to 1000)
SuccCnt		Success Count
ErrCnt		Error Count

TRSE

Torqeedo System Setup

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
I	instance	instance
Flag		Flags
MotType		Motor type
MotVer		Motor software version
BattCap	Ah	Battery capacity
BattPct	%	Battery charge percentage
BattType		Battery type
SwVer		Master software version

TRST

Torqeedo System State

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
I	instance	instance
F		Flags bitmask
Err		Master error code
MVolt	V	Motor voltage
MCur	A	Motor current
Pow	Watt	Motor power
RPM	rpm	Motor RPM
MTemp	degC	Motor Temp (higher of pcb or stator)
BPct	%	Battery charge percentage
BVolt	V	Battery voltage
BCur	A	Battery current

TSIT

tailsitter speed scailing values

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Ts		throttle scaling used for tilt motors
Ss		speed scailing used for control surfaces method from Q_TAILSIT_GSCMSK
Tmin		minimum output throttle calculated from disk thoery gain scale with Q_TAILSIT_MIN_VO

TSYN

Time synchronisation response information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
SysID		system ID this data is for
RTT	μs	round trip time for this system

UART

UART stats

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
I	instance	instance
Tx	B/s	transmitted data rate bytes per second
Rx	B/s	received data rate bytes per second, this is all incoming data, it may not all be processed by the driver using this port.
RxDp	B/s	Data rate of dropped received bytes, ideally should be 0. This is the difference between the received data rate and the processed data rate.

UBX1

uBlox-specific GPS information (part 1)

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Instance	instance	GPS instance number
noisePerMS		noise level as measured by GPS
jamInd		jamming indicator; higher is more likely jammed
aPower		antenna power indicator; 2 is don't know
agcCnt		automatic gain control monitor
config		bitmask for messages which haven't been seen

UBX2

uBlox-specific GPS information (part 2)

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Instance	instance	GPS instance number
ofsI		imbalance of I part of complex signal
magI		magnitude of I part of complex signal
ofsQ		imbalance of Q part of complex signal
magQ		magnitude of Q part of complex signal

UBXT

uBlox specific UBX-TIM-TM2 logging, see uBlox interface description

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
I	instance	GPS instance number
ch		Channel (i.e. EXTINT) upon which the pulse was measured
flags		Bitmask
count		Rising edge counter
wnR		Week number of last rising edge
MsR	ms	Tow of rising edge
SubMsR	ns	Millisecond fraction of tow of rising edge in nanoseconds
wnF		Week number of last falling edge
MsF	ms	Tow of falling edge
SubMsF	ns	Millisecond fraction of tow of falling edge in nanoseconds
accEst	ns	Accuracy estimate

UNIT

Message mapping from single character to SI unit

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Id		character referenced by FMTU
Label	char[64]	Unit - SI where available

VAR

Variometer data

FieldName	Units/Type	Description
TimeUS		Time since system startup
aspd_raw		always zero
aspd_filt		filtered and constrained airspeed
alt		AHRS altitude
roll		AHRS roll
raw		estimated air vertical speed
filt		low-pass filtered air vertical speed
cl		raw climb rate
fc		filtered climb rate
exs		expected sink rate relative to air in thermalling turn
dsp		average acceleration along X axis
dspb		detected bias in average acceleration along X axis

VER

Ardupilot version

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
BT	enum	Board type
BST	enum	Board subtype
Maj		Major version number
Min		Minor version number
Pat		Patch number
FWT		Firmware type
GH		Github commit
FWS	char[64]	Firmware version string
APJ		Board ID
BU	enum	Build vehicle type
FV		Filter version
IMI		IOMCU MCU ID
ICI		IOMCU CPU ID

VIBE

Processed (acceleration) vibration information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
IMU	instance	Vibration instance number
VibeX	m/s/s	Primary accelerometer filtered vibration, x-axis
VibeY	m/s/s	Primary accelerometer filtered vibration, y-axis
VibeZ	m/s/s	Primary accelerometer filtered vibration, z-axis
Clip		Number of clipping events on 1st accelerometer

VISO

Visual Odometry

FieldName	Units/Type	Description
TimeUS	μs	System time
dt	μs	Time period this data covers
AngDX	rad	Angular change for body-frame roll axis
AngDY	rad	Angular change for body-frame pitch axis
AngDZ	rad	Angular change for body-frame z axis
PosDX	m	Position change for body-frame X axis (Forward-Back)
PosDY	m	Position change for body-frame Y axis (Right-Left)
PosDZ	m	Position change for body-frame Z axis (Down-Up)
conf		Confidence

VISP

Vision Position

FieldName	Units/Type	Description
TimeUS	μs	System time
RTimeUS	μs	Remote system time
CTimeMS	ms	Corrected system time
PX	m	Position X-axis (North-South)
PY	m	Position Y-axis (East-West)
PZ	m	Position Z-axis (Down-Up)
R	deg	Roll lean angle
P	deg	Pitch lean angle
Y	degheading	Yaw angle
PErr	m	Position estimate error
AErr	deg	Attitude estimate error
Rst		Position reset counter
Ign		Ignored
Q	%	Quality

VISV

Vision Velocity

FieldName	Units/Type	Description
TimeUS	μs	System time
RTimeUS	μs	Remote system time
CTimeMS	ms	Corrected system time
VX	m/s	Velocity X-axis (North-South)
VY	m/s	Velocity Y-axis (East-West)
VZ	m/s	Velocity Z-axis (Down-Up)
VErr	m/s	Velocity estimate error
Rst		Velocity reset counter
Ign		Ignored
Q	%	Quality

VNAT

VectorNav Attitude data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Q1		Attitude quaternion 1
Q2		Attitude quaternion 2
Q3		Attitude quaternion 3
Q4		Attitude quaternion 4
Yaw	deg	Yaw
Pitch	deg	Pitch
Roll	deg	Roll
YU	deg	Yaw unceratainty
PU	deg	Pitch uncertainty
RU	deg	Roll uncertainty

VNIM

VectorNav IMU data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Temp	deg	Temprature
Pres	Pa	Pressure
MX	Gauss	Magnetic feild X-axis
MY	Gauss	Magnetic feild Y-axis
MZ	Gauss	Magnetic feild Z-axis
AX	m/s/s	Acceleration X-axis
AY	m/s/s	Acceleration Y-axis
AZ	m/s/s	Acceleration Z-axis
GX	rad/s	Rotation rate X-axis
GY	rad/s	Rotation rate Y-axis
GZ	rad/s	Rotation rate Z-axis

VNKF

VectorNav INS Kalman Filter data

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
InsStatus		VectorNav INS health status
Lat	deg	Latitude
Lon	deg	Longitude
Alt	m	Altitude
VelN	m/s	Velocity Northing
VelE	m/s	Velocity Easting
VelD	m/s	Velocity Downing
PosU	deg	Filter estimated position uncertainty
VelU	m/s	Filter estimated Velocity uncertainty

VSTB

Log message for video stabilisation software such as Gyroflow

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
GyrX	rad/s	measured rotation rate about X axis
GyrY	rad/s	measured rotation rate about Y axis
GyrZ	rad/s	measured rotation rate about Z axis
AccX	m/s/s	acceleration along X axis
AccY	m/s/s	acceleration along Y axis
AccZ	m/s/s	acceleration along Z axis
Q1		Estimated attitude quaternion component 1
Q2		Estimated attitude quaternion component 2
Q3		Estimated attitude quaternion component 3
Q4		Estimated attitude quaternion component 4

WDOG

Watchdog diagnostics

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Tsk		current task number
IE		internal error mast
IEC		internal error count
IEL		line internal error was raised on
MvMsg		mavlink message being acted on
MvCmd		mavlink command being acted on
SmLn		line semaphore was taken on
FL		fault_line
FT		fault_type
FA		fault address
FP		fault thread priority
ICSR		ICS regiuster
LR		long return address
TN	char[4]	Thread name

WENC

Wheel encoder measurements

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Dist0	m	First wheel distance travelled
Qual0		Quality measurement of Dist0
Dist1	m	Second wheel distance travelled
Qual1		Quality measurement of Dist1

WINC

Winch

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
Heal		Healthy
ThEnd		Reached end of thread
Mov		Motor is moving
Clut		Clutch is engaged (motor can move freely)
Mode		0 is Relaxed, 1 is Position Control, 2 is Rate Control
DLen	m	Desired Length
Len	m	Estimated Length
DRate	m/s	Desired Rate
Tens	UNKNOWN	Tension on line
Vcc	V	Voltage to Motor
Temp	degC	Motor temperature

WIND

Windvane readings

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
DrRaw	deg	raw apparent wind direction direct from sensor, in body-frame
DrApp	deg	Apparent wind direction, in body-frame
DrTru	degheading	True wind direction
SpdRaw	m/s	raw wind speed direct from sensor
SpdApp	m/s	Apparent wind Speed
SpdTru	m/s	True wind speed

XKF0

EKF3 beacon sensor diagnostics

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF3 core this data is for
ID		Beacon sensor ID
rng	m	Beacon range
innov		Beacon range innovation
SIV		sqrt of beacon range innovation variance
TR		Beacon range innovation consistency test ratio
BPN	m	Beacon north position
BPE	m	Beacon east position
BPD	m	Beacon down position
OFH	m	High estimate of vertical position offset of beacons rel to EKF origin
OFL	m	Low estimate of vertical position offset of beacons rel to EKF origin
OFN	m	North position of receiver rel to EKF origin
OFE	m	East position of receiver rel to EKF origin
OFD	m	Down position of receiver rel to EKF origin

XKF1

EKF3 estimator outputs

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF3 core this data is for
Roll	deg	Estimated roll
Pitch	deg	Estimated pitch
Yaw	degheading	Estimated yaw
VN	m/s	Estimated velocity (North component)
VE	m/s	Estimated velocity (East component)
VD	m/s	Estimated velocity (Down component)
dPD	m/s	Filtered derivative of vertical position (down)
PN	m	Estimated distance from origin (North component)
PE	m	Estimated distance from origin (East component)
PD	m	Estimated distance from origin (Down component)
GX	deg/s	Estimated gyro bias, X axis
GY	deg/s	Estimated gyro bias, Y axis
GZ	deg/s	Estimated gyro bias, Z axis
OH	m	Height of origin above WGS-84

XKF2

EKF3 estimator secondary outputs

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF3 core this data is for
AX		Estimated accelerometer X bias
AY		Estimated accelerometer Y bias
AZ		Estimated accelerometer Z bias
VWN	m/s	Estimated wind velocity (moving-to-North component)
VWE	m/s	Estimated wind velocity (moving-to-East component)
MN	mGauss	Magnetic field strength (North component)
ME	mGauss	Magnetic field strength (East component)
MD	mGauss	Magnetic field strength (Down component)
MX	mGauss	Magnetic field strength (body X-axis)
MY	mGauss	Magnetic field strength (body Y-axis)
MZ	mGauss	Magnetic field strength (body Z-axis)
IDX	m/s/s	Innovation in vehicle drag acceleration (X-axis component)
IDY	m/s/s	Innovation in vehicle drag acceleration (Y-axis component)
IS	rad	Innovation in vehicle sideslip

XKF3

EKF3 innovations

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF3 core this data is for
IVN	m/s	Innovation in velocity (North component)
IVE	m/s	Innovation in velocity (East component)
IVD	m/s	Innovation in velocity (Down component)
IPN	m	Innovation in position (North component)
IPE	m	Innovation in position (East component)
IPD	m	Innovation in position (Down component)
IMX	mGauss	Innovation in magnetic field strength (X-axis component)
IMY	mGauss	Innovation in magnetic field strength (Y-axis component)
IMZ	mGauss	Innovation in magnetic field strength (Z-axis component)
IYAW	deg	Innovation in vehicle yaw
IVT	UNKNOWN	Innovation in true-airspeed
RErr		Accumulated relative error of this core with respect to active primary core
ErSc		A consolidated error score where higher numbers are less healthy

XKF4

EKF3 variances. SV, SP, SH and SM are probably best described as 'Squared Innovation Test Ratios' where values <1 tells us the measurement was accepted and >1 tells us it was rejected. They represent the square of the (innovation / maximum allowed innovation) where the innovation is the difference between predicted and measured value and the maximum allowed innovation is determined from the uncertainty of the measurement, uncertainty of the prediction and scaled using the number of standard deviations set by the innovation gate parameter for that measurement, eg EK3_MAG_I_GATE, EK3_HGT_I_GATE, etc

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF3 core this data is for
SV		Square root of the velocity variance
SP		Square root of the position variance
SH		Square root of the height variance
SM		Magnetic field variance
SVT		Square root of the total airspeed variance
errRP		Filtered error in roll/pitch estimate
OFN	m	Most recent position reset (North component)
OFE	m	Most recent position reset (East component)
FS		Filter fault status
TS		Filter timeout status bitmask (0:position measurement, 1:velocity measurement, 2:height measurement, 3:magnetometer measurement, 4:airspeed measurement, 5:drag measurement)
SS	bitmask	Filter solution status
GPS		Filter GPS status
PI		Primary core index

XKF5

EKF3 Sensor innovations (primary core) and general dumping ground

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF3 core this data is for
NI		Normalised flow variance
FIX		Optical flow LOS rate vector innovations from the main nav filter (X-axis)
FIY		Optical flow LOS rate vector innovations from the main nav filter (Y-axis)
AFI		Optical flow LOS rate innovation from terrain offset estimator
HAGL	m	Height above ground level
offset	UNKNOWN	Estimated vertical position of the terrain relative to the nav filter zero datum
RI	UNKNOWN	Range finder innovations
rng	UNKNOWN	Measured range
Herr	m	Filter ground offset state error
eAng	rad	Magnitude of angular error
eVel	m/s	Magnitude of velocity error
ePos	m	Magnitude of position error

XKFD

EKF3 Body Frame Odometry errors

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF3 core this data is for
IX		Innovation in velocity (X-axis)
IY		Innovation in velocity (Y-axis)
IZ		Innovation in velocity (Z-axis)
IVX		Variance in velocity (X-axis)
IVY		Variance in velocity (Y-axis)
IVZ		Variance in velocity (Z-axis)

XKFM

EKF3 diagnostic data for on-ground-and-not-moving check

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF core this message instance applies to
OGNM		True of on ground and not moving
GLR		Gyroscope length ratio
ALR		Accelerometer length ratio
GDR		Gyroscope rate of change ratio
ADR		Accelerometer rate of change ratio

XKFS

EKF3 sensor selection

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF3 core this data is for
MI		compass selection index
BI		barometer selection index
GI		GPS selection index
AI		airspeed selection index
SS		Source Set (primary=0/secondary=1/tertiary=2)
GPS_GTA		GPS good to align
GPS_CHK_WAIT		Waiting for GPS checks to pass
MAG_FUSION		Magnetometer fusion (0=not fusing/1=fuse yaw/2=fuse mag)

XKQ

EKF3 quaternion defining the rotation from NED to XYZ (autopilot) axes

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF3 core this data is for
Q1	UNKNOWN	Quaternion a term
Q2	UNKNOWN	Quaternion b term
Q3	UNKNOWN	Quaternion c term
Q4	UNKNOWN	Quaternion d term

XKT

EKF3 timing information

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF core this message instance applies to
Cnt	s	count of samples used to create this message
IMUMin	s	smallest IMU sample interval
IMUMax	s	largest IMU sample interval
EKFMin	s	low-passed achieved average time step rate for the EKF (minimum)
EKFMax	s	low-passed achieved average time step rate for the EKF (maximum)
AngMin	s	accumulated measurement time interval for the delta angle (minimum)
AngMax	s	accumulated measurement time interval for the delta angle (maximum)
VMin	s	accumulated measurement time interval for the delta velocity (minimum)
VMax	s	accumulated measurement time interval for the delta velocity (maximum)

XKTV

EKF3 Yaw Estimator States

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF3 core this data is for
TVS	rad	Tilt Error Variance from symbolic equations (rad^2)
TVD	rad	Tilt Error Variance from difference method (rad^2)

XKV1

EKF3 State variances (primary core)

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF3 core this data is for
V00		Variance for state 0 (attitude quaternion)
V01		Variance for state 1 (attitude quaternion)
V02		Variance for state 2 (attitude quaternion)
V03		Variance for state 3 (attitude quaternion)
V04		Variance for state 4 (velocity-north)
V05		Variance for state 5 (velocity-east)
V06		Variance for state 6 (velocity-down)
V07		Variance for state 7 (position-north)
V08		Variance for state 8 (position-east)
V09		Variance for state 9 (position-down)
V10		Variance for state 10 (delta-angle-bias-x)
V11		Variance for state 11 (delta-angle-bias-y)

XKV2

more EKF3 State Variances (primary core)

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF3 core this data is for
V12		Variance for state 12 (delta-angle-bias-z)
V13		Variance for state 13 (delta-velocity-bias-x)
V14		Variance for state 14 (delta-velocity-bias-y)
V15		Variance for state 15 (delta-velocity-bias-z)
V16		Variance for state 16 (Earth-frame mag-field-bias-x)
V17		Variance for state 17 (Earth-frame mag-field-bias-y)
V18		Variance for state 18 (Earth-frame mag-field-bias-z)
V19		Variance for state 19 (body-frame mag-field-bias-x)
V20		Variance for state 20 (body-frame mag-field-bias-y)
V21		Variance for state 21 (body-frame mag-field-bias-z)
V22		Variance for state 22 (wind-north)
V23		Variance for state 23 (wind-east)

XKY0

EKF Yaw Estimator States

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF core this data is for
YC	degheading	GSF yaw estimate (deg)
YCS	deg	GSF yaw estimate 1-Sigma uncertainty (deg)
Y0	degheading	Yaw estimate from individual EKF filter 0 (deg)
Y1	degheading	Yaw estimate from individual EKF filter 1 (deg)
Y2	degheading	Yaw estimate from individual EKF filter 2 (deg)
Y3	degheading	Yaw estimate from individual EKF filter 3 (deg)
Y4	degheading	Yaw estimate from individual EKF filter 4 (deg)
W0		Weighting applied to yaw estimate from individual EKF filter 0
W1		Weighting applied to yaw estimate from individual EKF filter 1
W2		Weighting applied to yaw estimate from individual EKF filter 2
W3		Weighting applied to yaw estimate from individual EKF filter 3
W4		Weighting applied to yaw estimate from individual EKF filter 4

XKY1

EKF Yaw Estimator Innovations

FieldName	Units/Type	Description
TimeUS	μs	Time since system startup
C	instance	EKF core this data is for
IVN0	m/s	North velocity innovation from individual EKF filter 0 (m/s)
IVN1	m/s	North velocity innovation from individual EKF filter 1 (m/s)
IVN2	m/s	North velocity innovation from individual EKF filter 2 (m/s)
IVN3	m/s	North velocity innovation from individual EKF filter 3 (m/s)
IVN4	m/s	North velocity innovation from individual EKF filter 4 (m/s)
IVE0	m/s	East velocity innovation from individual EKF filter 0 (m/s)
IVE1	m/s	East velocity innovation from individual EKF filter 1 (m/s)
IVE2	m/s	East velocity innovation from individual EKF filter 2 (m/s)
IVE3	m/s	East velocity innovation from individual EKF filter 3 (m/s)
IVE4	m/s	East velocity innovation from individual EKF filter 4 (m/s)