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    Re: Meridional Distances
    From: Arthur Pearson
    Date: 2002 Sep 17, 19:28 -0400

    Lest the authors of the Silicon Sea legs think their work unappreciated,
    I for one have begun working the legs. I worked the last leg published
    primarily using the Traverse Tables in a 1965 version of Bowditch that
    give very similar results to the official answers. I note that when I
    downloaded the tables from the current version of Bowditch online, the
    current configuration if the tables is much less flexible and precise
    than the '65 version.  Although one has several table lookups to get a
    solution, the older tables allow solution of problems <1,000 nm with
    -----Original Message-----
    From: Navigation Mailing List
    [mailto:NAVIGATION-L@LISTSERV.WEBKAHUNA.COM] On Behalf Of Peter Fogg
    Sent: Tuesday, September 17, 2002 6:53 PM
    Subject: Meridional Distances
    Have recently come across a new (to me) method of calculating rhumb line
    courses and distances, and also traverse calculations, where the
    starting position, course and distance are known, and the finishing
    position needs to be calculated.
    The method uses not just Meridional Parts, with which I am familiar, but
    also Meridional Distances, which are new to me.
    Although I have tables accurate to 2 decimal places for the Meridional
    Parts, the Meridional Distances come only in whole degrees, so need to
    be interpelated for in-between values.
    Despite this the method is simple and straight-forward enough, no more
    complex or prone to error than alternative methods. I am told it is
    particularly accurate, although I don't know if there is any way to
    check this. Used on old Silicon Sea problems it gives answers similar
    but not identical to the official answers, but then so do other methods
    - mostly!
    With a new Silicon Sea leg in the offing I intend to post a comparison
    of a few different methods (assuming it contains any such problems) and
    let others compare the results with their own methods.

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