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    Re: Position discrepancy
    From: Derrick Young
    Date: 2011 Dec 13, 15:03 -0500

    You need to look at which earth model is being used for the Almanac, Henning’s, the online almanacs as well as your GPS.  The variation of several nautical miles is not unusual with the different models.

     

    Derrick Young

    DeCA/CARTS PMO

    804-734-8000, x48561

    804-332-4025

     

    Our virtues and our failings are inseparable, like force and matter. When they separate, man is no more." --Nikola Tesla, Austrian-American inventor and engineer

     

    From: navlist-bounce@fer3.com [mailto:navlist-bounce@fer3.com] On Behalf Of Fred Stevens
    Sent: Tuesday, December 13, 2011 1:44 PM
    To: NavList@fer3.com
    Subject: [NavList] Position discepancy

     

    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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