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    Re: Sextant Positions versus Map Datums?
    From: Jared Sherman
    Date: 2002 Jan 17, 7:42 PM

    Trevor-
     Thanks the for correct URL. Their list seems to show that any datum shift (in 
    the eastern US) will account for less than 100' of error in pretty much the 
    worst case, although the USGS conversion program shows slightly more when I 
    ran the numbers on one location.
     In any case 100' should be negligible, this weekend I will try to check MY 
    errors as well as looking into whether the maps I was using may have simply 
    had a mapping error for the landmark. In the 70's the Adirondack Mountain 
    Club maps for one portion of NY's Catskill Mountains used to literally have a 
    "Note to Enemy Bombers" on one quad, apparently there was a mountain charted 
    a good mile out of position. (And who would really notice or care, in the 
    hills of interior New York. Not a big government budget priority at that 
    time.)
    
     Thanks all, I think the datum error question is pretty much worked out--at least within limits--now.
    

       
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