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    Re: SA eliminator
    From: Dave Boatman
    Date: 1997 Dec 13, 12:02 PM

    At 07:32 AM 12/13/97 -0800, you wrote:
    [snip]
    >it to its theoretical limits, but I have heard from a friend that
    >surveyors use something like this to achieve accuracy in that order.
    >
    >  I suppose the trick would be finding a point of known La, Lo that met
    >the demands of accuracy sufficient to test the GPS.
    >
    >  I hope that anyone with more and better information will feel free to
    >correct me for any errors here.
    >
    >  Mal Misuraca
    
    I'll lend some knowledge as to the surveyors.   I spent some time with the
    surveyors of a large construction project here, building a bridge across
    Pearl Harbor onto Ford Island.  The surveyors were walking around with radio
    packs and antennas on their backs so I just *HAD* to find out all about it.
    
    Turns out they placed portable repeater antennas right nearby on the
    hillsides around here and were using a differential GPS to triangulate the
    placement of the 400 concrete pilings for the bridge.   They claimed an
    accuracy of 3/4 of an inch for each piling.
    
    The point being that, at least on this project, they didn't use averaging
    and a computer but direct GPS from a surveyed portable antenna.
    
    Maybe someone who is a surveyor can be more specific as to the technical
    details.
    
    Dave Boatman
    Fantasia35
    LAKA/Honolulu
    dboat{at}lava.net
    
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