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    Re: Fixes consistantly south and west of GPS
    From: Paul Hirose
    Date: 2014 Nov 15, 15:16 -0800

    On 2014-11-15 13:06, Randall Morrow wrote:
    > I don't think the fix has ever been to the east or north.
    That is an extraordinary bias. What was the datum setting in your GPS
    receiver when you measured your observing position? I assume you have
    verified the coordinates a few times.
    Are you interpreting the GPS readout properly? Not to insult your
    intelligence, but lat/lon is vulnerable to blunders due to the three
    flavors in use (D.d, DM.m, and DMS.s).
    However, I think the most likely explanation is a systematic error in
    your observation or reduction technique, combined with an unbalanced set
    of azimuths (perhaps due to visibility constraints at your site). For
    instance, from my porch I can observe only west of the meridian. If I
    always measure altitudes too high, my fixes will always fall west of the
    true position.

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