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A nautical mile is a unit of measurement defined as exactly 1852 meters -LRB- about 6,076.1 feet or 1.1508 statute miles -RRB- .. unit of measurement. units of measurement. feet. Foot ( unit ). Historically , it was defined as one minute of latitude , which is equivalent to one sixtieth of a degree of latitude .. one minute of latitude. Minute and second of arc#Cartography. latitude. latitude. Today it is an SI derived unit , being rounded to an even number of meters and remains in use for both air and marine navigation and for the definition of territorial waters .. SI derived unit. SI derived unit. navigation. navigation. territorial waters. territorial waters. One tenth of a nautical mile is a cable length .. cable. Cable length. cable length. cable length. The derived unit of speed is the knot , defined as one nautical mile per hour .. speed. speed. knot. knot ( unit ). The geographical mile is the length of one minute of longitude along the Equator , about 1,855.325 m on the WGS 84 ellipsoid .. geographical mile. geographical mile. longitude. longitude. WGS 84. WGS 84