NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Quicker Ex-Meridian Formula for Slide Rule or Calculator
From: Greg Rudzinski
Date: 2016 Dec 1, 09:35 -0800
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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