Various units of length used at sea, all of them in principle the length of 1 mean minute of arc on the meridian.
When the values for Earth’s polar and equatorial radii are based on the International Terrestrial Geoid, the nautical mile has a value of 1852.276 meters.¹ Since 1929, however, most nations have used the international nautical mile.
1. International Union of Geodesy and Geophysics.
Bull. géod. int. volume 157, 540, 552. (1925)
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