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    Re: "100 Problems in Celestial Navigation"
    From: Rodney Myrvaagnes
    Date: 2004 Apr 1, 18:19 -0500

    On Thu, 1 Apr 2004 14:21:30 -0800, David Weilacher wrote:
    
    >I bought this book years back and gave up on it because it lacks proofs for 
    the answers given.  I had considered using this forum to help but couldn't 
    figure out how to do that without infringing on the author's well deserved 
    copyright.
    >
    >OTOH, answers 5-10nm different than his, aren't particularly unreasonable.  
    HO229, HO249, and various plotting programs, etc, can have that kind of 
    variation between them.  Even using the same tables, a sight reduction form 
    can introduce differences.
    >
    Is that really so? I have always considered it to indicate
    sextant-reading errors if I came out more than a mile from actual (GPS)
    location. 5-10 seems excessive for different reduction methods from the
    same data. Am I taking your meaning correctly?
    
    I haven't tried all those table-based methods, but have used
    calculators and a spreadsheet program, the latter based on the analytic
    reduction method in the Nautical Almanac.
    
    
    
    
    Rodney Myrvaagnes     NYC                                               J36 Gjo/a
    
    
    "Accordions don't play 'Lady of Spain.' People play 'Lady of Spain."
    
    
    

       
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