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    Annual Increase of Variation
    From: Richard Pinkowitz
    Date: 2002 Feb 12, 07:41 -0500

    Everyone:
    
    What is the cause of the "annual" portion of the magnetic variation on
    the compass rose?
    
    Although this "annual variation" is listed for my area of the US,
    Massachusetts, as about 1' - 3' this has not been recognized in the
    "total magnetic variation" in the charts we have used over the past 20
    years.  At 3' per year we would have seen a 1 degree change in variation
    over the past 20 years.
    
    Is this annual variation in a constant direction or does it oscillate?
    
    Answers would be appreciated so that I could respond to the navigation
    class.
    
    Rich Pinkowitz
    
    
    

       
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