NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Fred Stevens
Date: 2011 Dec 13, 10:43 -0800
I have a known location... well, "known" as far as Google
Earth goes. I am assuming that it is a correct position
since it is verified by GPS. When I go to either the NA or
online almanacs, like USNO Almanac or Henning Umland's to
verify the coordinates using Jupiter and Polaris, there is
always a significant discrepancy between them and those from
GPS/GoogleEarth, a few nautical miles at the very least.
Enough to be worrisome if at sea.
Any idea why so much difference?
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