CSV Log Columns Reference

Complete reference for all columns in OnSpeed SD card log files. Data is logged at 50 Hz.

Columns are written in three groups: (1) base core columns (timeStamp through Roll), (2) optional Boom and/or EFIS columns when those features are enabled, (3) derived core columns (EarthVerticalG through CoeffP). Parse by column name — direct index positions shift when optional blocks are enabled.

Core Columns — Base

Column	Units	Description
timeStamp	ms	Milliseconds since power-on
Pfwd	counts	Pitot pressure, bias subtracted (14-bit ADC)
PfwdSmoothed	counts	Pitot pressure after median + running-average smoothing
P45	counts	AOA pressure, bias subtracted (14-bit ADC)
P45Smoothed	counts	AOA pressure after median + running-average smoothing
PStatic	mbar	Static (barometric) pressure
Palt	ft	Pressure altitude
IAS	knots	Indicated airspeed
AngleofAttack	degrees	Computed AOA from pressure polynomial
flapsPos	degrees	Detected flap position
DataMark	0–99	Pilot data annotation (wraps at 100)
OAT	°C	Outside air temperature
TAS	knots	True airspeed
imuTemp	°C	IMU330 sensor temperature
VerticalG	G	Vertical acceleration (body Z-axis)
LateralG	G	Lateral acceleration (body Y-axis)
ForwardG	G	Forward acceleration (body X-axis)
RollRate	deg/s	Roll angular rate (gyro)
PitchRate	deg/s	Pitch angular rate (gyro)
YawRate	deg/s	Yaw angular rate (gyro)
Pitch	degrees	Pitch angle (AHRS output, smoothed)
Roll	degrees	Roll angle (AHRS output, smoothed)

Core Columns — Derived

Appended after any optional Boom/EFIS columns.

Column	Units	Description
EarthVerticalG	G	Vertical acceleration in Earth frame
FlightPath	degrees	Flight path angle = arcsin(VSI/TAS)
VSI	fpm	Vertical speed (Kalman filtered)
Altitude	ft	Altitude (Kalman filtered, MSL)
DerivedAOA	degrees	SmoothedPitch − FlightPath
CoeffP	—	Pressure coefficient (P45/Pfwd)

Boom Probe Columns (When Boom Enabled)

Column	Units	Description
boomStatic	PSI	Static pressure from boom
boomDynamic	PSI	Dynamic (pitot) pressure from boom
boomAlpha	degrees	Angle of attack from boom
boomBeta	degrees	Sideslip angle from boom
boomIAS	knots	Indicated airspeed from boom
boomAge	ms	Time since last boom data packet

EFIS Columns — Dynon/Garmin/MGL

When EFIS type is ADVANCED, DYNOND10, GARMING5, GARMING3X, or MGL:

Column	Units	Description
efisIAS	knots	IAS from EFIS
efisPitch	degrees	Pitch angle from EFIS
efisRoll	degrees	Roll angle from EFIS
efisLateralG	G	Lateral acceleration from EFIS
efisVerticalG	G	Vertical acceleration from EFIS
efisPercentLift	%	Percent lift / AOA (0–99%)
efisPalt	ft	Pressure altitude from EFIS
efisVSI	fpm	Vertical speed from EFIS
efisTAS	knots	True airspeed from EFIS
efisOAT	°C	Outside air temperature from EFIS
efisFuelRemaining	gal	Fuel remaining
efisFuelFlow	gph	Fuel flow rate
efisMAP	inHg	Manifold absolute pressure
efisRPM	rpm	Engine RPM
efisPercentPower	%	Computed percent power
efisMagHeading	degrees	Magnetic heading
efisAge	ms	Time since last valid EFIS packet
efisTime	ms	Timestamp from EFIS

EFIS Columns — VectorNav VN-300

When EFIS type is VN-300:

Column	Units	Description
vnAngularRateRoll	rad/s	Roll rate
vnAngularRatePitch	rad/s	Pitch rate
vnAngularRateYaw	rad/s	Yaw rate
vnVelNedNorth	m/s	North velocity (NED frame)
vnVelNedEast	m/s	East velocity (NED frame)
vnVelNedDown	m/s	Down velocity (NED frame)
vnAccelFwd	m/s²	Forward acceleration
vnAccelLat	m/s²	Lateral acceleration
vnAccelVert	m/s²	Vertical acceleration
vnYaw	degrees	Yaw angle
vnPitch	degrees	Pitch angle
vnRoll	degrees	Roll angle
vnLinAccFwd	m/s²	Linear forward acceleration
vnLinAccLat	m/s²	Linear lateral acceleration
vnLinAccVert	m/s²	Linear vertical acceleration
vnYawSigma	rad	Yaw uncertainty
vnRollSigma	rad	Roll uncertainty
vnPitchSigma	rad	Pitch uncertainty
vnGnssVelNedNorth	m/s	GPS north velocity
vnGnssVelNedEast	m/s	GPS east velocity
vnGnssVelNedDown	m/s	GPS down velocity
vnGnssLat	degrees	GPS latitude
vnGnssLon	degrees	GPS longitude
vnGPSFix	enum	GPS fix quality
vnDataAge	ms	Time since last VN-300 packet
vnTimeUTC	HH:MM:SS.cc	UTC time from VN-300