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[NavList 12029] How good is St. Hilaire?
From: richard.reed---co.uk
Date: 25 Feb 2010 17:38

Dear Richard,

Excellent insight of yours on Marcq Saint Hilaire's Method. And thank you very much.

Since MSH's method is not "stricto sensu" a "full exact one shot mathematical method", we should not forget that if 1 st position derived after first round of computation is significantly far from initial DR position (some 30NM/40NM if you go "manual", or only 10NM for example if you have quick semi-automated computation power, or as small as you wish if you can parameter this value in fully automated computations), we should use it again as an updated DR position. And here, such iteration method/algorithm immediately shows MSH's deadly cconvergence rate, with its actual accuracy limit being almost always reached to 0.1 NM/0.2 NM after the third iteration at the most. Its only limitation - an unavoidable and unescapable one common to ALL and ANY other mathematical treament of the same raw data - is both (in)accuracy of the measurements and (too) small interception angles of the LOP's.

Have a great day !

Antoine M. "Kermit" Couëtte
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