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Old 20th Nov 2022, 02:53
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Pilot DAR
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Join Date: Aug 2006
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Reported groundspeed is GPS derived speed
Okay, I should ask my question a little differently then... Is the GPS (or GNSS) derived [ground] speed considered in two dimensions - parallel to the earth's surface? Or in three dimensions, considering an altitude change as an element in the speed? If the plane is diving at a severe angle, is the ADS-B reported speed considering the vertical speed as an element in the "groundspeed" in the third dimension? IN the extreme, if a plane dived vertically, would it indicate any "groundspeed" on the ADS-B output?
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