Originally Posted by Yaatri

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You are absoultely confused. There is no way the GPS can give you air speed without other data. Since, GPS,. fundamentally measures position, and the rate of change of position is the ground speed, not air speed, it measures ground speed. It needs airspeed data to calculate airspeed. If you don;t get that simple principle, you need to learn a bit about GPS, and about ground speed, as well as airspeed.