Direction which the ship is pointing at a given time.

Type of direction which is measured with reference to the ship's longitudinal axis.

Position where two or more LOPs intersect, that indicates the ship's exact position on the chart.

Floating devices found at sea to guide the mariners for the safe navigation of their vessel.

Type of buoy that indicate the position of hazards at sea where the vessel may pass in a considerable distance in any direction.

Type of buoy that indicates the direction of movement of ships coming from the sea and the limit of the channels used for navigation.

Used by mariners to measure the direction of an object.

Line that passes through the original site of the royal observatory in Greenwich.

It is the art and science of directing, controlling and monitoring of the movement s of a vessel from one place to another in the shortest, safest and most secured possible way.