CSV Log Columns Reference¶

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

Core Columns (Always Present)¶

Column	Units	Description
`timeStamp`	ms	Milliseconds since power-on
`Pfwd`	counts	Raw pitot pressure (14-bit ADC: 0–16383)
`PfwdSmoothed`	PSI	Pitot pressure after EMA smoothing
`P45`	counts	Raw AOA pressure (14-bit ADC)
`P45Smoothed`	PSI	AOA pressure after EMA smoothing
`PStatic`	PSI	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)
`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)

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

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

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