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    Re: magnetic variation calculator
    From: Bill Murdoch
    Date: 2005 Feb 25, 10:15 EST
    In a message dated 2/25/05 8:24:29 A.M. Eastern Standard Time, mdorl@WISC.EDU writes:
    I wonder if Bill M is from the UP (Michigan Upper peninsula)?  It's
    interesting to look at a map showing the section corners in the UP or the
    iron range in Minnesota.  It looks like the section corners were put in by
    a drunk.  Of course they were put in using a compass.  I remember a story
    an old professor I had told about putting in section corners in Kansas.  He
    said they got a wagon, tied a bandana to a wheel spoke and calibrated the
    wheel.  They then drove the wagon across the prairie steering by compass
    and counting the wheel turns until it was time for another corner.
    I'm in East Tennessee. 
    One of my "favorite" nautical chart notes is in the area near the entrance to the Chesapeake Bay.  It says "LOCAL MAGNETIC DISTURBANCE Differences of as much as 6 degrees from the normal variation have been observed 3 to 17 nautical miles offshore from Cape Henry to Currituck Beach Light."  Normal is 10 degrees 45 minutes west.  It puts a little doubt in the TVMDC.  If you were also figuring your longitude by local variation, you might miss the entrance to the bay.
    Bill Murdoch
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