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 =
Philippine Nautical Highway System Philippine Nautical Highway System The Philippine Nautical Highway System, also the "Road Roll-on/Roll-off Terminal System" (RRTS) or simply the "RoRo System", is an integrated network of highway and vehicular ferry routes which forms the backbone of a nationwide vehicle transport system in the Philippines. It is a system of roads and ports developed by the Philippine government to connect the major islands of Luzon, the Visayas and Mindanao. The 919 kilometer nautical highway was opened to the public on April 12, 2003 as the Strong Republic Nautical Highway (SRNH). Its route covers the provinces and cities of Tagaytay and Batangas