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A nautical mile is a unit of length used in air, marine, and space navigation, and for the definition of territorial waters. [2] [3] [4] Historically, it was defined as the meridian arc length corresponding to one minute ( 1 / 60 of a degree) of latitude at the equator, so that Earth's polar circumference is very near to 21,600 nautical miles (that is 60 minutes × 360 degrees).
In radar-related subjects and in JTIDS, a data mile is a unit of distance equal to 6,000 feet (1,829 metres; 0.9875 nautical miles; 1.136 miles). An international mile is 0.88 data mile. The speed of light is 299,792,458 metres per second (983,571,056 ft/s), or about one foot per nanosecond .
Nautical mile: Length: Rhumb: Angle: The angle between two successive points of the thirty-two point compass (11 degrees 15 minutes) (rare) [1] Shackle: Length: Before 1949, 12.5 fathoms; later 15 fathoms. [2] Toise: Length: Toise was also used for measures of area and volume Twenty-foot equivalent unit or TEU: Volume: Used in connection with ...
1.15078 miles per hour (approximately), 20.25372 inches per second (approximately) 1.68781 feet per second (approximately). The length of the internationally agreed nautical mile is 1 852 m. The US adopted the international definition in 1954, having previously used the US nautical mile (1 853.248 m). [6]
[89] In the United States, the nautical mile was defined in the 19th century as 6,080.2 feet (1,853.24 m), whereas in the United Kingdom, the Admiralty nautical mile was defined as 6,080 feet (1,853.18 m) and was about one minute of latitude in the latitudes of the south of the UK. Other nations had different definitions of the nautical mile.
ftin (feet and inches) ft m (foot m) inch: in in Use of ′ and ″ symbols violates MOSNUM so is not provided. 1.0 in (25 mm) in cm; in mm; Other: nautical mile: nmi nmi the international standard nautical mile For other nautical miles see the full list. 1.0 nmi (1.9 km; 1.2 mi) parsec: pc pc 1.0 pc (3.3 ly) light-year: ly ly 1.0 ly (63,000 AU ...
The value formerly used in the United States was 6,080.20 feet = 1 nautical (geographical or sea) mile." [ 6 ] [ 7 ] This deprecated value of 6,080.2 feet is equivalent to 1,853.24 m. A separate reference identifies the geographic mile as being identical to the international nautical mile of 1,852 m and slightly shorter than the British ...
ftin (feet/inches) ft m (foot m) hand: hand h 1.0 h (4 in; 10 cm) inch: in in Use of ′ and ″ symbols violates MOSNUM so is not provided. 1.0 in (25 mm) in cm; in mm; Maritime units: nautical mile: nmi nmi the international standard nautical mile 1.0 nmi (1.9 km; 1.2 mi) nautical mile: oldUKnmi (admiralty nmi) nmi 6080 ft the pre-1970 ...