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    Position discepancy
    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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