In the datalog, is the ‘current speed’ the indicated air speed or true air speed?

[Kevin Surminski]

One of the standard fields recorded in the datalog is the current speed, Field ID# 1055 [currentSpeed]; By default* this value is measured from the difference in static and dynamic pressure by the autopilots calibrated airspeed transducer, this would be the indicated airspeed.

If you wanted to log true airspeed (indicated airspeed adjusted by temperature/density due to altitude) you would log Field ID# 1872 [trueAirSpeed].

 

*Note that Field ID# 196 [useGpsData] can be used to replace the airspeed transducer data with GNSS speed.