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    Re: Sextant Positions versus Map Datums?
    From: Pierre Boucher
    Date: 2002 Jan 19, 4:07 PM

    >Bill-
    >NAD 83 --  30:16:28.82N, 97:44:25.19W --or-- 30d16m28.77992N, 97d44m25.10907s
    >NAD-27 --  30:16:28.03N, 97:44:24.09W
    >WGS-72 --  30:16:28.68N, 97:44:25.75W
    >
    >Interesting because using the USGS "Corpscon" conversion tool, I entered
    >the NAD27 position and asked for the NAD83 position, which as you can see
    >differs from the ones that the Texans found. Question being, did they read
    >a map and measure from it? Or convert datums, using a formula different
    >from the one the USPS supplied?
    
    While to my knowledge ther is only one NAD83 datum there are at least 11
    different NAD27 datum so one as the pick the right one to compare.
    
    Pierre
    

       
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