[GeoStL] Re: GPSr use in commercial aircraft
- From: Geocachette@xxxxxxx
- To: geocaching@xxxxxxxxxxxxx
- Date: Sat, 16 Aug 2003 14:20:34 EDT
Of course, I'm only guessing. But since barometric pressure fluctuates from
day to day even in the same location, the GPS unit most likely uses the GPS
sytem of satelites and triangulation to calculate the elevation.
Am I all wet on this?
Georgie
In a message dated 8/16/03 9:19:53 AM Pacific Daylight Time,
goshhawk@xxxxxxxxxxx writes:
>
> -
> 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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