IALA Buoyage System A

IALA Buoyage System Region A is one of the two regional lateral-mark conventions in the IALA Maritime Buoyage System (Recommendation R1001), used across Europe, Africa, Australia, New Zealand, the Gulf, and most of Asia. In Region A a vessel entering harbor from seaward keeps red can-shaped port-hand marks on its left and green conical starboard-hand marks on its right (the mnemonic: is there any red port left). Preferred-channel marks combine the two colors. Cardinal marks, isolated-danger marks, safe-water marks, and special marks are identical in both regions; only the lateral red-green sense differs. The other system, Region B (the Americas, Japan, Korea, the Philippines), reverses the lateral colors.