Buoyage IALA Buoys are the signposts of the Sea. Each one has a particular meaning and tells you to go a particular way.
Colours - black over yellow Lights - white, quick or very quick flash (continuous) East cardinal Top marks - base to base Colours - black on top and bottom, yellow middle Lights - white, group of three South cardinal Top marks - both points downwards Colours - black below, yellow above Lights - white, group of six flashes, followed by one long flash. West cardinal Top mark - point to point Colours - black middle, yellow top and bottom. Lights - white, group of nine
Cardinal marks Cardinal marks come in the cardinal points on the compass:- North, East, South and West. And you should pass that side of the mark, for example:- to the North of a North cardinal mark and to the east of a East cardinal mark. They usually mark large areas of danger such as shoals or sand banks but can be used in any situation. North cardinal Top marks - both points upwards
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