IALA System
Marks are distinguished by their colour, being red or green, and shape.
For historical reasons, two different schemes are in use worldwide, differing in their use of colour.
Previously there had been 30 different buoyage systems, prior to IALA introducing the rationalised system. In 1980 on a conference convened by IALA, they agreed to adopt the rules of a new combined system, which combined the previous two systems (A and B) into one system, with two regions (A and B).
The IALA defines them as Region A and Region B:
- Region A comprises nations in Europe, Australia, New Zealand, parts of Africa and most of Asia other than the Philippines, Japan and Korea.
- Region B comprises nations in North America, Central America and South America, the Philippines, Japan and Korea.
Read more about this topic: Lateral Mark
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