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    Re: Slip answers
    From: Herbert Prinz
    Date: 2003 Apr 25, 14:36 +0000

    Hello Doug,
    I once used a measured mile for a speed check in the Long Island Sound (near
    Greenwich Harbor, if I remember correctly) and another one somewhere on the East
    Coast on my way up to Maine. In neither case did I have to convert from statute
    miles. I am pretty sure I remember this correctly, since I strictly refuse to
    know what a statute mile is. (For religious reasons. I was raised metric.)
    My charts are on the boat, so I can't check now. Maybe somebody else on the list
    happens to know these mile markers near Greenwich, or other ones.
    In the USA, Statute miles are unfortunately used on inland waters, which include
    not only all lakes and rivers but also the Intracoastal Waterways. Could it be
    that the test question in the examination was set in that scenario?
    I would also be curious to learn whether these measured courses are still being
    used in actual practice, or whether they have been replaced by using
    differential GPS. I can imagine that calibration of any instrument out at sea by
    means of GPS,  particularly since SA is off, is nowadays the more accurate
    method, as the effects disturbing the measurement which are resulting from the
    vicinity of the shore would be eliminated.
    Herbert Prinz
    "Royer, Doug" wrote:
    > I do know that in the states the timed mile markers that are along shore for
    > checking speed are in statute miles and that is what the examiner was
    > looking for.I calculated 351.7 mi.(nautical mi.)and got it wrong.That's all
    > I can tall you on that.

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