Can somebody please explain to me the technique to measure your plane's
true
airspeed by flying in 3 or 4 different directions for a while and
recording
GPS ground speed ? Do you just fly the same amount of time each leg and
average the groundspeed readings ?



One more source:
http://www.cockpitgps.com/other_arti..._compass_and_c
alcul.htm

John Bell
www.cockpitgps.com