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Old 16th Feb 2015, 11:54
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AirborneAgain
 
Join Date: Aug 2013
Location: Northern Europe
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I can't make sense of your answer.

With a GPS, the only altitude you can determine is absolute altitude. Vertical airspace limits are never defined in terms of absolute altitude, only barometric altitude.

So how does SkyDemon know the barometric altitude of the aircraft?
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