Nautical mile

A nautical mile is a unit of length used in air, marine, and space navigation, and for the definition of territorial waters. Historically, it was defined as the meridian arc length corresponding to one minute (1/60 of a degree) of latitude at the equator, such that Earth's polar circumference is very near to 21,600 nautical miles (that is 60 minutes × 360 degrees). Today the international nautical mile is defined as 1,852 metres (about 6,076 ft; 1.151 mi). The derived unit of speed is the knot, one nautical mile per hour.

This article is about distance measurement at sea. For distance measurement on land, see mile. For the U.S. unit based on the Equator, see geographical mile.
Nautical mile
Unit oflength
SymbolM, NM, or nmi
Conversions
1 M, NM, or nmi in ...... is equal to ...
   metre   1,852
   foot   ≈ 6,076
   statute mile   ≈ 1.151
   cable   10
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