It’s as easy as A, B, Sea: K for Knot

Knot is a measure of nautical speed. More specifically one knot equals one nautical mile per hour. One nautical mile equals 6,080 feet.

The term knot came from how sailors calculated speed. They threw a log with a rope attached to it overboard. The rope had knots evenly spaced (every 47 feet and 3 inches). Therefore, by calculating the knots let out in a specific time frame (every 28 seconds) the speed was calculated.

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