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 star Nautical star The nautical star is a symbolic star associated with the sea services of the United States armed forces and with tattoo culture. It is usually rendered as a five-pointed star in dark and light shades counterchanged in a manner reminiscent of a compass rose. The nautical star is frequently encountered as an informal signifier indicating membership in the United States Coast Guard, United States Navy, or Marine Corps. The symbol recalls both the five-pointed star of the US national flag and the distinctive color pattern of the compass rose found on many nautical charts. The nautical star also