true airspeed applet
by Craig Cox

This is the TrueAirspeed applet.

The True Airspeed applet will allow a pilot to accurately determine the true airspeed of an aircraft using a GPS or loran unit. The airborne procedure requires approximately 10-15 minutes of stabilized flight to collect groundspeeds in three separate directions, and the ground procedure requires only a few minutes to type those groundspeeds into the applet.