CSV Log Columns Reference¶

Complete reference for all columns in OnSpeed SD card log files. Data is logged at 50 Hz by default (configurable to 208 Hz via the web interface).

Columns are written in four 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), (4) tail-optional flapsRawADC. 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 (ISA 1013.25 hPa reference; no Kollsman/QNH correction). Computed each row from `PStatic`.
`IAS`	knots	Indicated airspeed
`AngleofAttack`	degrees	Computed AOA from pressure polynomial
`flapsPos`	degrees	Detected flap position (snapped to the nearest configured detent)
`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	Pressure altitude, Kalman-filtered. Same quantity as `Palt`, smoothed with vertical accel. Not MSL — ISA reference, no Kollsman/QNH correction.
`DerivedAOA`	degrees	SmoothedPitch − FlightPath
`CoeffP`	—	Pressure coefficient (P45/Pfwd)

Boom Probe Columns (When Boom Enabled)¶

Column	Units	Description
`boomStatic`	counts¹	Static pressure from boom
`boomDynamic`	counts¹	Dynamic (pitot) pressure from boom
`boomAlpha`	counts¹	Angle of attack from boom
`boomBeta`	counts¹	Sideslip angle from boom
`boomIAS`	knots	Indicated airspeed from boom
`boomAge`	ms	Time since last boom data packet

¹ Raw ADC counts by default. When BOOMCONVERTDATA=true the firmware applies the polynomial calibration curves in onspeed_core/BoomConvert.h and writes physical units (PSI for boomStatic / boomDynamic, degrees for boomAlpha / boomBeta). BOOMCONVERTDATA defaults to false.

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

Tail-Optional Columns (Format Version 2)¶

Appended at the end of every row, after CoeffP. Older firmware (format version 1) omits these columns; parsers must look up by name from the header line rather than by fixed position.

Column	Units	Description
`flapsRawADC`	counts	Raw flap-lever pot ADC reading (uint16, typically 0–4095 on the 12-bit ADC). Lets replay and analysis tools reproduce the L/Dmax pip slide across detent transitions; consumers interpolate the pip lever-end-to-end using this value against the configured `<FLAPPOTPOSITIONS>` boundaries.