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    Re: Tvmdc
    From: Chuck Taylor
    Date: 1997 May 06, 18:05 EDT

    On Tue, 6 May 1997, Millard Kirk wrote:
    ...
    > 	I know this has been lengthly, but I have a couple other questions:
    >
    > 1) How is desired course plotted on charts?   True or Magnetic?
    The course on the chart (the course line itself) is the same either
    way. How it is LABELED is another story. The book answer is to label all
    courses with respect to true north. For one reason, magnetic variation
    changes from year to year, and a compass course computed 10 years ago
    may not be accurate today. For another, the accepted standard practice
    is to label all courses as true, so anyone looking at the plot will
    expect it to be so (such as your brother-in-law, the professional
    mariner, who has graciously agreed to stand all the midwatches on
    your next passage. :-) ).
    > 2) When one has a Chart that has only the true markings, no compass
    > rose, how is course usually plotted? True or magnetic ???
    Plot and label it as true. Compute the compass course and enter it in
    your log (there should be a column for it, as well as columns for true
    course, variation, magnetic course, and deviation, all in the proper
    sequence).
    Chuck Taylor
    Everett, WA, USA
    ctaylor{at}XXX.XXX
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