Key:seamark:buoy_lateral:system

There are two international buoyage regions, A and B, between which lateral marks differ. The buoyage region is encoded using the separate attribute "system" (MARSYS). Lateral buoys generally have distinctive shapes (can for port-hand, conical for starboard-hand) or may be a pillar or spar with distinctive topmarks. The buoys and their topmarks are always painted in red, green or red & green horizontal bands.

Region A

• comprises Europe, Africa, and most of Asia and Oceania, as well as Greenland.
• port marks are red and may have a red flashing light of any rhythm except 2+1.
• starboard marks are green and may have a green flashing light of any rhythm except 2+1.

(Port) (Left) (Red)	(Starboard) (Right) (Green)

Region B

• comprises the Americas, Japan, South Korea, the Philippines, Taiwan, Hawaii, and Easter Island.
• port marks are green and may have a green flashing light of any rhythm except 2+1
• starboard marks are red and may have a red flashing light of any rhythm except 2+1

(Port) (Left) (Green)	(Starboard) (Right) (Red)

Values

• seamark:buoy_lateral:system=iala-a
• seamark:buoy_lateral:system=iala-b