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    Re: DR vs EP vs MPP vs Fix vs Running fix
    From: Trevor Kenchington
    Date: 2002 Feb 7, 18:44 -0400

    I understand Chuck Taylor's logic supporting Bowditch's strictly-limited
    definition of the DR plot. But there have to be practical limits. Chuck wrote:
    > 5. Navigate in such a manner that both my DR and my intended track stay out of
    > harm's way, allowing plenty of margin for error.
    If I was navigating my way towards Avonmouth, at the head of the Bristol
    Channel (and so to the commercial and yacht harbour of Bristol's City
    Docks), in order to follow a safe track, my DR plot would necessarily
    cross a number of dangerous sand banks and would likely end up far
    inland -- unless I constantly re-started it from frequent fixes. Much
    the same would be true if I attempted a less probable (but not
    impossible) cruise through the Minas Basin at the head of the Bay of
    Fundy and indeed anywhere else where strong tidal streams are combined
    with a curved coastline.
    What practical use does the DR plot have in such a situation?
    Trevor Kenchington
    Trevor J. Kenchington PhD                         Gadus@iStar.ca
    Gadus Associates,                                 Office(902) 889-9250
    R.R.#1, Musquodoboit Harbour,                     Fax   (902) 889-9251
    Nova Scotia  B0J 2L0, CANADA                      Home  (902) 889-3555
                        Science Serving the Fisheries

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