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 =
Nautical Archaeology Society Nautical Archaeology Society The Nautical Archaeology Society (NAS) is a charity registered in England and Wales and in Scotland and is a company limited by guarantee. The charitable aims and object of the company are to further research in Nautical Archaeology and publish the results of such research and to advance education and training in the techniques pertaining to the study of Nautical Archaeology for the benefit of the public. Nautical archaeology is an archaeological sub-discipline more generally known as maritime archaeology, which encompasses the archaeology of shipwrecks, underwater archaeology and archaeology of related features. The society's logo is derived