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    Re: Practice CN on cruise ship
    From: Gary LaPook
    Date: 2017 Oct 21, 23:16 -0700

    http://fer3.com/arc/m2.aspx/That-magic-number-3438-FrankReed-nov-2016-g37081

    ---------------------------------------------------

    Frank - I'm interested in where the 3438 figure for using the sextant as a
    rangefinder comes from.
    
       
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