Question: What is Nautical Mile ?


A nautical mile is a measurement of distance at sea. It is 6083 feet, which is about 1.15 ordinary miles. A natural mile is one-sixtieth of the distance along the equator between two lines of longitude which differ by 1o. A speed of 1 nautical mile per hour is known as a knot.

A nautical mile is also known as sea mile. It is a unit of length which corresponds approximately to one minute of latitude along any meridian.

The international standard definition is: 1 nautical mile = 1,852 metres exactly. There is no commonly accepted international standard symbol for the unit nautical mile. The preferred abbreviation of the IEEE is nmi, while M is used by the BIPM and the maritime authorities of the USA and Canada. For aviation use, the preferred abbreviation of the ICAO is NM. The abbreviation nm, though conflicting with the SI symbol for the nanometre is also in widespread use.