At 10:23 AM 14/09/2011, you wrote:
I'm not sure that a mistake and misinformation are quite the same.....
Essentially they are. The mis-information is the result of the
mistake. If the mistake was deliberate it would be dis-information.
There is a push at IGC level to use GPS altitude for records above
50,000 feet. Very sensible as the change in pressure with altitude is
very small up there. Around a 1/10 of the sea level value. Also for
Silver and Gold height gains to be able to use GPS only. Eventually
the IGC will get sensible and use it for everything. There will need
to be specific testing of the characteristics of the GPS receiver
though. They aren't all equal, even quite modern ones, unless set up
for flight dynamics and 3D navigation full time and no Dead Reckoning.
Mike
Borgelt Instruments - manufacturers of quality soaring instruments since 1978
phone Int'l + 61 746 355784
fax Int'l + 61 746 358796
cellphone Int'l + 61 428 355784
email: [email protected]
website: www.borgeltinstruments.com
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