True Airspeed Calculator
To calculate the true airspeed of your aircraft, fly three legs at
headings that differ by 90 degrees. For example, fly north, east, and
then south, but any initial heading will do.
Determine the ground speed on each of the legs using your GPS. Then
plug all the data into the form below and find your true airspeed and
actual wind speed. If you also provide the correct initial heading,
you'll get the wind direction. Any speed unit will work, the output
will be in the same unit as the input.
If you are curious why and how all of this works, you can find a detailed
description of this technique in a tech note (requires
©2000-2002 EAA Chapter 62
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