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    Re: Meridional Distances
    From: Dan Hogan
    Date: 2002 Sep 18, 09:28 -0700

    For practical navigation I have been using Mercator Sailing and Meridional
    Parts using the formula from The Calculator Afloat, by Shufeldt and Newcomer,
    Naval Inst. Press, 1980, ISBN 0-87021-116-1.
    
            M = 7915.7045 x Log tan (45d x L/2) - 23.2689 sin L
    
            M = Meridional Part
            L = latitude
    
    For the 90d/270d problem I have changed the TC +/- 1d depending on the
    hemisphere. Couldn't use Rhumb Line because it wouldn't fit in my HP 35SII
    and still have my other DR formulae.
    
    
    Dan Hogan WA6PBY
    C27 "Gacha"
    dhhogan1---.net
    Nav-L Page: http://www.wa6pby.com
    
    
    

       
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