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    DR Plotting
    From: Lu Abel
    Date: 2009 Aug 04, 16:29 -0700

    Does anyone know when constant plotting of courses and dead reckoning
    positions became commonplace in near-shore navigation?
    I have both 1914 and 1925 editions of Bowditch.    Both contain lots of
    information about fixing position, not only by bearings and running
    fixes, but by vertical angles, circles of position, bow-and-beam
    bearings, etc -- but nothing about keeping a DR plot.   The nearest they
    have to DR positioning is comments on "adding up courses run" to get an
    estimate of position -- but it's pencil-and-paper calculations, not
    plotting the way Bowditch teaches today.
    I'm going to guess that the transition was made in the 1930s because I
    believe DR plotting was well established by the time of WW II.
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