Nautical mile 1 sea mile", followed by "For most practical purposes distance is measured from the latitude scale, assuming that one minute of latitude equals one nautical mile". One tenth of a nautical mile is a cable length. The derived unit of speed is the knot, defined as one nautical mile per hour. The metre was originally defined as of the meridian arc from the North pole to the equator passing through Dunkirk. The Earth’s circumference is therefore approximately 40,000 km. The equatorial circumference is slightly longer than the polar circumference – the measurement based on this (40,075.017 km x x =
Adlard Coles Nautical "Heavy Weather Sailing", which continues to be published by the company (in an updated form). A & C Black Publishers, which had bought Nautical Books in 1987, acquired the Adlard Coles company in 1990 and merged the two companies into the Adlard Coles Nautical imprint. In 2000, A & C Black was bought by Bloomsbury Publishing Plc and in 2003 the company acquired the "Reeds Nautical Almanac". In September 2014, Bloomsbury bought Conway Publishing and the maritime history list now complements the Adlard Coles Nautical imprint. Adlard Coles Nautical Adlard Coles Nautical is a nautical publisher, with over 300 books