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"Peter" <peternew@nospamoptonline.net> wrote in message news:480b1e06$0$13863$8f2e0ebb@news.shared-secrets.com... "krishnananda" <k@ashram.in> wrote in message news:48043751$0$7726$4c368faf@roadrunner.com... I recommend looking at the classic "Handbook of Mathematics" by Bronshtien, Semendyayev, Musiol, and Muehlig, pp. 128 - 179, Chapter 3 "Geometry". This covers elementary

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pre-GPS you would devide the "ortodrome" (line along a great circle) into multiple "loxodromes" (lines of constant bearing), each of which you run along at a constant (true) heading. the more loxodromes the closer they will be to the orthodrome, which also represents the shortest way possible. (my dad called loxodromes "the exact detour") the procedure is to calculate the latitudes at which