Thanks Mike for the article on your website.
Here is another article on barometric vs gps altitude.
http://bhgc.wikidot.com/tutorials:differences-between-pressure-and-gps-altitude
The hang gliding community has been writing extensively about this
subject and ended up with using barometric altitude. Firstly because
that is the usual way to measure height in aviation, but secondly and
more important, it was found out that GPS altitude can be out by as
much as 500ft in extreme cases due to poor signal from the satellites.
regards,
Mart
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