Preferred channel marks

The preferred channel mark indicates where a channel divides when proceeding in the “conventional direction of buoyage”. The preferred channel mark to starboard has a shape of a can, pillar or spar, and is red with one green horizontal band. As a top mark, if any exists, it has a single red can. When fitted with a light, it exhibits a red light with a composite group flashing of 2 + 1.
The preferred channel mark to port has a shape of a cone, pillar or spar, and is green with one red horizontal band. As a top mark, if any exists, it has a single green cone pointing upward. When fitted with a light, it exhibits a green light and has a composite group flashing of 2 + 1.