nautical mile

sea mile, nautical measure of distance equal to 6076 feet

A nautical mile or sea mile is a unit of length. It is a non-SI unit used by special interest groups such as navigators in the shipping and aviation industries. It is commonly used in international law and treaties, especially regarding the limits of territorial waters. It developed from the geographical mile.
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Noun
1. a British unit of length equivalent to 1,853.18 meters (6,082 feet)
(synonym) naut mi, mile, mi, geographical mile, Admiralty mile
(hypernym) nautical linear unit
2. a unit of length used in navigation; equivalent to the distance spanned by one minute of arc in latitude; 1,852 meters
(synonym) mile, mi, naut mi, knot, international nautical mile, air mile
(hypernym) nautical linear unit

A unit of distance used in navigation and based on the length of one minute of arc taken along a great circle. Note 1: Because the Earth is not a perfect sphere, various values have been assigned to the nautical mile. The value 1852 meters (6076.1 ft.) has been adopted internationally. Note 2: The nautical mile is frequently confused with the geographical mile, which is equal to 1 min of arc on the Earth's equator (6087.15 ft.).

nautical mile
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