"Marco Leon" wrote in message
oups.com...
I thought the primary factor in determining the differences between
baro altitude and GPS altitude was the difference between "sea level"
and the WGS84 datum plane at the particular location? From my
understanding these two planes of reference are not the same but are
closer in some spots than in others.

Marco

Pressure based altitude measurements also assume a standard pressure change
as a function of altitude that will not always be correct. This will cause
the difference between the altimeter and the GPS to change with altitude.

--
Geoff
The Sea Hawk at Wow Way d0t Com
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