[GeoStL] Re: GPSr use in commercial aircraft
- From: <goshhawk@xxxxxxxxxxx>
- To: <geocaching@xxxxxxxxxxxxx>
- Date: Sat, 16 Aug 2003 11:17:08 -0500
-
I have a question about GPS altitude measurement.
I think that my Garmin Vista determines altitude by sensing barometric
pressure. In an aircraft cruising at 37000 feet, the inside cabin altitude
is maintained at about 8000-9000 feet. Thus wouldn't the GPSr only read
cabin altitude and not the actual height above ground ?
What is the general altitude measuring source in GPSr's?
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