### Distance

**Nautical Mile: **

For the measurement of distances navigation uses nautical mile. Nautical Mile equals to 1852 meters and is sub- divided into cables of one **tenth** of the nautical mile. The maximum value of a mile at the poles is 1864 meters and the minimum value at the equator is 1842,8 meters.

## Distance

In navigation the term ‘distance’ defines the length of the imaginary line that connects two points on the Earth’s surface.

## Speed

In general, speed is the covered distance in the unit of time. When at sea, speed is measured in** knots**. The knot equals to a mile per hour speed.