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#19
November 27th 08, 10:08 PM
posted to rec.aviation.piloting
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Questions on high altitude pressures
Wolfgang Schwanke wrote:
In theory you could use GPS altitudes when flying MSL/QNH setting, No. Even with MSL/QNH setting, as you call it, the barometric altimeter does *not* show the true geometric altitude. More precisely, it only shows it in two cases: 1. When sitting on the ground at the reference altitude for the given altimeter setting (QNH) 2. When the atmosphere happens to be an ICAO standard atmosphere. 
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