nautical miles (mn)
The nautical mile, or nautical mile, is a unit of length used in sea and air transport. Currently, the international definition, adopted in 1929, is the conventional value of 1853,2 m, which is approximately the length of an arc of 1' (one minute of arc, one sixtieth of a degree (sexagesimal) of latitude of the earth. This unit of length does not belong to the International System of Units (SI).