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Posted

as you may know CDU steer info page shows wind direction and speed. my question is how the aircraft knows about wind direction and speed? is it come from GPS or other outside sources or the aircraft measure it by itself?

Posted

It knows where the plane is pointed at and how fast it is flying in the air. Through the inertial navigation system (backed by GPS in modern planes) it knows in which direction and how fast it is travelling over ground.

 

The difference between these is the wind speed and direction.

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Posted

You may choose GPS mode instead of blended mode for EGI from NAV Page.

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