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nautical mile, knot

Nautical miles are often used in marine or aeronautical context, but specify when using nautical miles.

One nautical mile equals 1.15 statute miles or 1.852 kilometers.

A knot is a measurement unit of speed equivalent to one nautical mile (1,852 meters) an hour:
            a speed of ten knots, not knots an hour or knots per hour
            The boat reaches a top speed of 20 knots.

See also MEASURES.