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Nautical Mile per Hour
The knot is a unit of speed equal to one nautical mile (1.852 km) per hour, approximately 1.151 mph. The abbreviation kn is preferred by the International Hydrographic Organization (IHO), which includes every major seafaring nation; but the abbreviations kt (singular) and kts (plural) are also widely used conflicting with the SI symbol for kilotonne which is also "kt". The knot is a non-SI unit accepted for use with the International System of Units (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 one minute of geographic latitude in one hour.