IALA Buoyage: Region A vs. Region B - Differences in Color & Numbering

The main difference between the buoyage of IALA (International Association of Marine Aids to Navigation and Lighthouse Authorities) region A and region B lies in the color and numbering of navigation aids.\n\n1. IALA Region A:\n- In region A, the primary color for port (left-hand) lateral marks is red.\n- The primary color for starboard (right-hand) lateral marks is green.\n- Cardinal marks have a combination of yellow and black colors.\n- Isolated danger marks are black with one or more horizontal red bands.\n- Safe water marks are vertically striped with red and white.\n\n2. IALA Region B:\n- In region B, the primary color for port (left-hand) lateral marks is green.\n- The primary color for starboard (right-hand) lateral marks is red.\n- Cardinal marks have a combination of black and yellow colors.\n- Isolated danger marks are black with one or more horizontal yellow bands.\n- Safe water marks are vertically striped with black and white.\n\nThe purpose of the different color and numbering schemes in the two regions is to ensure consistent and easily understandable navigation aids for mariners around the world, regardless of their location.