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Any of various units of distance, used for sea and air navigation, based
on the length of a minute of arc of a great circle of the Earth and
differing because the Earth is not a perfect sphere: (1) a British unit
that equals 6,080 ft or 1,853.2 m; also called Admiralty mile; (2) a U.S.
unit, no longer in official use, that equals 6080.20 ft or 1,853.248 m;
and (3) an international unit that equals 6,076.1033 ft or 1,852 m; used
officially in the United States since July 1954. Webster 3rd
Source:
Dictionary of Mining, Mineral, and Related Terms
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