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    Re: What is this chart?
    From: David F. McCune
    Date: 2006 May 29, 00:28 -0500

    Are you referring to a set of pilot charts?  I have those.  I think the
    chart I was asking about is from old sailing directions.  Since my post, I
    found a similar chart in Pub. 152, "Sailing Directions (Planning Guide) for
    the North Pacific Ocean" 1989 Edition.  I like it because it is fairly
    small, simple, and shows many common great circle routes.  The pilot charts
    have a wealth of information, of course, but just a few of the common great
    circle routes.

    The reason I care about all this is because I sail solo, and I've noticed
    that I almost never see ships far out in the ocean that are not on a great
    circle route from one port to another.  So by having a quick reference for
    seeing, say, the great circle route between Balboa and the Luzon Strait, I
    can figure out if I am safe sleeping several hours at a stretch or if I need
    to keep a better lookout as I cross one of these routes.

    I can do the same thing by drawing the routes myself of a great circle
    chart, and then plotting my own position on that chart, but it is easier to
    have a mercator chart with the common routes drawn.

    If anyone happens to have a Pub. 140 (North Atlantic sailing directions),
    perhaps you could tell me if there is such a chart tucked into the book as
    there was in the North Pacific version.


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