Buoyage system 1

There are two major types of buoyage systems:
the lateral system and the cardinal.
In the Lateral system the buoys indicate the port and starboard boundaries of a route to be followed e.g. a channel. The Lateral system differs between buoyage system A and B.
Buoyage system A is employed in Europe, Africa and Asia, where the green buoys mark the starboard side of the channel when approaching from seaward, while buoyage system B is used in North, Central and South America, Korea and the Philippines, where the red buoys mark the starboard side of the channel when approaching from seaward.
In the Cardinal system, the buoys indicate where the mariner may find navigable water, and are used in conjunction with a compass.