Knot 22
Knot 22 : Unit of speed equal to one nautical mile (6,080.20 ft.) per hour. One statute mile equals .868 nautical mile, or one nautical mile equals 1.15 statute miles. In the days of sail, speed was measured by tossing a log overboard which was secured by a line to the vessel. Knots were tied into the line at approximately six feet intervals (the breadth of a man arm span). As the vessel sailed on, the number of knots passing over the side in a measured period of time was counted and thus became the measure of ship speed
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