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 =
RPM Nautical Foundation RPM Nautical Foundation RPM Nautical Foundation is a non-profit archaeological research and educational organization dedicated to the advancement of maritime archaeology that includes littoral surveys and excavation of individual shipwreck and harbor sites. RPM Nautical Foundation (RPMNF) is organized to operate exclusively for charitable, scientific, literary and educational purposes, all within the meaning of sections 170(c)(2) and 501(c)(3) of the United States Internal Revenue Code. The operating purpose of the company is to engage in the detection, identification, study and preservation of nautical archaeological and historic sites for scientific research, public education, the advancement of technology. The organization also provides