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    Re: Annual Increase of Variation
    From: Dave Weilacher
    Date: 2002 Feb 13, 07:40 -0500

    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 fat 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.
    Original Message:
    From: Richard Pinkowitz richpink@WORLD.STD.COM
    Date: Tue, 12 Feb 2002 07:41:57 -0500
    Subject: [NAV-L] Annual Increase of Variation
    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
    Rich Pinkowitz
    mail2web - Check your email from the web at
    http://mail2web.com/ .

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