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    Re: Quicker Ex-Meridian Formula for Slide Rule or Calculator
    From: Greg Rudzinski
    Date: 2016 Dec 1, 09:35 -0800

    Ronald,

    Attached is the ex-meridian method page 69 from Slide Rule for Sea and Air Navigation. There is a difference between the method I use based on the Bowditch table 29 And 30 table formula. The multiplying constant of .5235 is the same for slide rule marking. Cos of Altitude is used in place of Cos (Latitude +/- Declination).  This is a good alternative method but doesn't allow the navigator to precalculate so that only the square of the meridian angle remains to complete the XM reduction.

    Greg Rudzinski



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