A knot is a navigation term used in the navy to describe the measurement of the speed of a ship. One knot is about 1 nautical mile per hour or 1.85 km or 1.15 statue miles per hour. Therefore, a ship that is sailing at 10 knots; this speed would be equivalent to a car moving on land at about 11.50 miles per hour. You can find more information here: http://www.britannica.com/EBchecked/topic/320511/knot
