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    Position by compass variation
    From: Jack Ganssle
    Date: 2006 Nov 24, 09:09 -0800

    Hi folks,
    I've enjoyed lurking on this group and learning more about old-time
    navigation in this electronics-obsessed age. GPS is wonderful but we
    still take sextant sights about our sailboat while at sea, for practice
    and fun.
    Wolfgang K�berer in his interesting post about the NMM said something
    in passing about determining position by variation. That sort of
    boggles my mind as variation - especially off the US East coast -
    changes slowly with distance. How does this work? And, how, especially
    long ago, did mariners determine variation with any sort of precision?
    Thanks much,
    Jack Ganssle
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