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    Re: Variation of compass
    From: Michael Wescott
    Date: 2002 Oct 3, 13:25 -0400

    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
    
    
    

       
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