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    Hav-Doniol re-visited
    From: David C
    Date: 2020 Apr 29, 15:13 -0700

    In the "Lockdown madness" thread Michael used the Doniol method. This method  does can use the DR position so I decided to reduce my "lockdown in the park" sight with Doniol using the Rivendell position. I remembered that over the years there had been lengthy discussions about Doniol. I searched the group and found Greg's Ocean Navigator article.

    Greg's article on hav-Doniol in "Ocean Navigator"

    NavList message 31625

    To summarise  the Doniol method in Bowditch  is a cos/haversine method.  Greg Rudzinski and Hanno Ix modified the formula to create an all haversine method.

    In the ON article is an azimuth graph. The graph uses the parameter "C" but I cannot find a definition of this term. Explanation please?

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