NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Dave Walden
Date: 2012 Dec 26, 20:19 -0800
No, I mean the use of Martelli for altitude difference lines: "Altitude by Martelli's Tables" Boatswain H.V. Hopkins, USCG, USNI Proc v59, 1933 p.1171
Both methods in my Bowditch in p524, under Martelli.
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Martelli works as a sight reduction method by providing a longitude for the DR latitude which becomes a Sumner point of the LOP. The LOP is gotten by adding 90 degrees to the azimuth which is then plotted through the Sumner point. This method is something I became aware of only recently. There is no mention of this in Bowditch.
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