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    Re: Traditional navigation by slide rule
    From: Gary LaPook
    Date: 2016 Oct 28, 02:11 -0700

    Since the value of  (45+lat/2)will always be greater than 45 you will find it on the tan2 scale.  Since that scale goes up to 84 the latitude will be limited to 78 degrees  (45+78/2) which is not a problem for most of us. 

    Gl

       
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