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    Re: Variation of compass
    From: Dave Weilacher
    Date: 2002 Oct 3, 10:38 -0700

    Actually it was intuitively obvious to the most casual observer; right after
    I'd pressed the send button.
    
    On Thu, 3 Oct 2002 13:25:22 -0400 Michael Wescott 
    wrote:
    
    > daveweilacher{at}EARTHLINK.NET said:
    > > One thing I attempted was to compute compass
    > variation by assuming a
    > > GP for the mag north pole of 82N x 108W then
    > doing a sight reduction
    > > to obtain azimuth (Zn).
    >
    > > Ended up deciding there were two problems
    > with this; both biggies.
    >
    > > First, it ignores the earths own magnetic
    > anomolies. No help for this.
    >
    > > Second, it gives me an initial great circle
    > bearing when I suspect
    > > what I'm really after is a rhumbline bearing.
    >
    > Great circle is what you want, much the same as
    > a fix on a radio beacon.
    >
    > --
    >         Mike Wescott
    >         Wescott_Mike{at}EMC.COM
    >
    
    
    
    Dave Weilacher
    .US Coast Guard licensed captain
    .    #889968
    .ASA certified sailing and celestial
    .    navigation instructor #990800
    .IBM AS400 RPG contract programmer
    
    
    

       
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