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    Re: Still on LOP's
    From: Peter Fogg
    Date: 2002 May 23, 09:33 +1000

    WSMurdoch{at}AOL.COM wrote:
    
    'Systematic errors expand some cocked hats and contract others.'
    
    One error is built into our system, and that is that our LOPs are drawn
    as straight lines, whereas they are really arcs, portions of circles.
    The further the hat is from the intersection of the LOP and the azimuth
    line the more pronounced this error will be.
    
    Also, the further the fix position is from the DR the longer will be the
    intercepts, and the less likely it is to be accurate.
    
    The solution to both  (and indeed generally helpful with regard to
    errors?) is to redo the sight reduction process ( its as easy as
    checking it carefully !) using the initial fix position as the new DR.
    In theory this could be done indefinitely, but the Law of Diminishing
    Returns means that you quickly (once or twice) exhaust its usefulness.
    
    
    

       
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