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Old November 12th 06, 03:16 PM posted to rec.aviation.piloting,rec.aviation.student
Stefan
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Posts: 578
Default Setting altimeters with no radio

Mxsmanic schrieb:

Well, what exactly are their reference datum(s?).


GPS uses a theoretical model of the earth's surface--a geoid. It may
or may not coincide with sea level.


Which is as theoretical a value.

Stefan