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    Re: Annual Increase of Variation
    From: Brian Whatcott
    Date: 2002 Feb 13, 07:12 -0600

    At 06:40 AM 2/13/02, Dave Weilacher wrote:
    >It is my understanding that the magnetic north pole lives at somewhere
    >around 75 north by 95 west;  this being the area that most compasses point
    >to. (except french ones I'm told).
    >
    >The "pole" is moving west approx 1 degree of longitude per
    >year.  Longitude where we are is pretty far compared to 75 north plus a 1
    >degree change in longitude that far away makes for a very small great
    >circle correction to us.
    >
    >I would still like to know if there is a geographical position of the pole
    >that I could use to reduce a variation.
    
    I have seen a chart showing the irregular loops that describe the long term
    locus of the north magnetic pole. I understand the US mapping authority
    provides a new chart of isogonals each ten years. I suppose that if you
    look at the northern confluence of the isogonals on a current chart of this
    kind, you have the best estimate of the magnetic pole as of the date of
    publication.
    
    
    Brian Whatcott
       Altus OK                      Eureka!
    
    
    

       
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