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    Re: St Hilaire not Iterative was: Finding The Symmedian
    From: Jeremy C
    Date: 2010 Dec 27, 08:29 EST
    Andrew wrote
     
    "I will try to explain.
    A navigator using plotting techniques introduces greater errors
    which stem from these techniques (placing a ruler, drawing line along its
    edge are not exact operations, especially on a small cluttered badly lit
    table which rocks back and forth). Assuming your AP is within a degree,
    the error introduced by Hilaire method would be smaller then the errors
    introduced by the act of plotting lines. Doing second iteration would be
    a waste of time."
     
    ---------------------
     
     
    I second this Andrew.  The vast majority of my error come from manual plotting when I choose to do so.  I am just not accurate enough in my plotting to do justice to my observations and the mathematics.  My pencil lead is certainly greater than 0.1 degrees wide in AZ column and I can't get the intercept measured on standard plotting sheets better than 0.25 nm for the most part using my triangles.  Heck, I can't even plot the advanced/retarded AP's accurately enough for my tastes.
     
    This is one of the major reasons why I use computers to give me a fix and then just transcribe the given fix as a Lat and Long to the chart.  It is also much neater on the chart which makes the Captain happier.
     
    Jeremy
       
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