Nautical mile

A nautical mile is a unit of length used in air, marine, and space navigation,[2] and for the definition of territorial waters.[3] Historically, it was defined as the meridian arc length corresponding to one minute (1/60 of a degree) of latitude. Today the international nautical mile is defined as exactly 1852 metres (6076 ft; 1.151 mi). The derived unit of speed is the knot, one nautical mile per hour.

Nautical mile
Unit systemNon-SI unit
Unit ofLength
SymbolM, NM, or nmi
1 M, NM, or nmi in ...... is equal to ...
   metre   1852[1]
   foot   ≈6076
   statute mile   ≈1.151
   cable   10
Historical definition – 1 nautical mile
Visual comparison of a kilometre, statute mile, and nautical mile