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    Re: Short term magnetic anomalies
    From: Don Seltzer
    Date: 2017 Sep 6, 08:39 -0400
    On Tue, Sep 5, 2017 at 2:23 PM, Bob Goethe <NoReply_Goethe@fer3.com> wrote:
    ... when out of the sight of land the prudent sailor might determine the azimuth to a celestial object and verify the variation at his current location from time to time, even if he has in hand a chart with magnetic contour lines indicated.

    I believe that was part of the daily routine aboard naval vessels 200 years ago, using the sunrise or sunset.

    'The pilots now their azimuth attend,
    On which all courses, duly formed, depend .
    The compass placed to catch the rising ray,
    ...
    By this magnetic variance is explored,
    Just angles known, and polar truth restored...

    - William Falconer

    Don Seltzer

       
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