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post #141 of Old 06-01-2011
MikeWhy
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Re. the 1 minute and 3 minute rules... FWIW, they are close enough to exact, relative to the knot meter's precision. They round off a nautical mile from 6076 feet to 6000 feet for mental calculation's sake, which amounts to slightly more than 1% high. (Thanks. I hadn't heard of them before.) The 6 minute rule, of course, is exact by definition.
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