nautical milenautical mile
any of various units of distance for sea and air navigation: in the U.S. since 1959, an international unit of length, equal to one minute of arc of a great circle of the earth or 6,076.12 feet or 1.1508 miles (1,852 meters or 1.852 kilometers): abbrev. NM
A unit of length used in sea and air navigation, based on the length of one minute of arc of a great circle, especially an international and US unit equal to 1,852 meters (about 6,076 feet). Also called sea mile .