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    Re: 3 Lop's
    From: Geoffrey Kolbe
    Date: 2004 Nov 15, 07:52 +500

    Alex wrote:-
       >Some books consider finding a fix from 3 lines
       >of position. This case also popped up in our infinite
       >discussion of the Averaging.
       >Can anyone explain, under what circumstances one could
       >possibly want to determine her position from 3 LOP's?
       >It is hard to imagine (for me) such circumstances.
       >(Hard but possible).
    It is only with 3 LOP's that you can create a cocked hat :)
    Seriously though, 4 LOP's, with azimuths approximately 90 degrees apart, are
    better than two.
    The 4 LOP's would create two sets of "tram lines" at right
    angles to each other. The 4 LOP's are reduced to two by bisecting each set
    of tramlines. Your position is now uniquely defined by the intersection of
    these two LOP's.
    The advantage of this procedure is a reduction, if not complete elimination,
    of errors in dip or index error.
    Geoffrey Kolbe

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