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    Re: That magic number: 3438
    From: Robin Stuart
    Date: 2016 Nov 4, 13:41 -0700

    David,

          You wrote: Which I suppose is because in this case 3438 is being used as a constant and is effectively dimensionless.

    It's really just that the ratio (length of ship/distance to ship) doesn't depend on the units. As Frank noted the appearance of 3438 in the formula is "thanks to the way the nautical mile is defined",

    Regards,

    Robin

       
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