What is the difference between Ground Speed and True Airspeed?

True Airspeed (TAS) is the speed of the aircraft relative to the airmass it is flying through. Ground Speed (GS) is the speed of the aircraft relative to the ground. GS is affected by wind; a tailwind increases GS, while a headwind decreases it.

How do I calculate Ground Speed?

Ground speed can be calculated using vector addition or the Law of Cosines. You need your True Airspeed, Wind Speed, Wind Direction, and Course. The formula accounts for the wind angle relative to your course.

What is Wind Correction Angle (WCA)?

The Wind Correction Angle is the number of degrees you must crab (turn) into the wind to maintain your desired course track over the ground.

Ground Speed Calculator

Instant calculation of Ground Speed, Heading & Wind Correction Angle.

Quick Scenarios:

True Airspeed (TAS) Speed relative to surrounding air

Wind Speed

Wind Direction (from) Magnetic direction wind is blowing FROM

Desired Course Track you want to fly over ground

Ground Speed: —

Enter inputs to see results.

Heading –°

WCA –°

Calculations based on Vector Triangle:

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