<P> The knot (/ nɒt /) is a unit of speed equal to one nautical mile (1.852 km) per hour, approximately 1.15078 mph . The ISO Standard symbol for the knot is kn . The same symbol is preferred by the Institute of Electrical and Electronics Engineers (IEEE); kt is also common . The knot is a non-SI (International Standard) unit that is "accepted for use with the SI". Worldwide, the knot is used in meteorology, and in maritime and air navigation--for example, a vessel travelling at 1 knot along a meridian travels approximately one minute of geographic latitude in one hour . </P> <P> Etymologically, the term derives from counting the number of knots in the line that unspooled from the reel of a chip log in a specific time . </P>

What is a knot in nautical miles per hour