nautical mile

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nautical mile

A ship's captain measures a distance of one nautical mile on a nautical chart.

Definition
  1. Noun:
    • A unit of length used in navigation; exactly 1,852 meters: This is the international standard, defined as exactly 1,852 meters. It is based historically on one minute of arc of latitude along any meridian.
    • A former British unit of length equivalent to 6,080 feet (1,853.184 meters): This is the UK Admiralty nautical mile, also known as the "Admiralty mile." It is longer than both the international nautical mile and the statute (land) mile.
Usage

The nautical mile is the primary unit of measurement for distance at sea and in air navigation. It is used on charts, for measuring speed (knots), and for reporting distances over water or through the air. * The ship traveled 120 nautical miles from the port. * The international nautical mile is defined as 1,852 meters exactly. * Air traffic control cleared the flight for a route spanning several hundred nautical miles.

Advanced Usage
  • "Knot": A unit of speed equal to one nautical mile per hour. The term nautical mile is integral to this definition.
    • The vessel's speed was 15 knots (15 nautical miles per hour).
  • In technical and legal contexts, such as international treaties or aviation regulations, the specific definition (international vs. historical UK) of the nautical mile is crucial.
Variants and Related Words
  • Sea mile: Sometimes used as a synonym for nautical mile, though it can have slightly different historical definitions.
  • Geographical mile: A related historical unit, approximately equal to one minute of arc along the equator (about 1,855.3 meters).
  • Knot (n): The unit of speed derived from the nautical mile (1 knot = 1 nautical mile per hour).
Synonyms
  • nm (abbreviation)
  • M (abbreviation in aviation, from the first letter of "mile")
  • nmi (common modern abbreviation)
Related Phrases
  • Nautical chart: A map specifically designed for navigation, which uses nautical miles for its scale.
  • Nautical distance: A distance measured in nautical miles.
nautical mile

A ship's captain measures a distance of one nautical mile on a nautical chart.

Noun
  1. a unit of length used in navigation; exactly 1,852 meters; historically based on the distance spanned by one minute of arc in latitude
  2. a former British unit of length equivalent to 6,080 feet (1,853.184 meters); 800 feet longer than a statute mile

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