International Regulations for Preventing Collisions at Sea

The International Regulations for Preventing Collisions at Sea 1972 (COLREGS) are published by the International Maritime Organization (IMO), and set out, inter alia, the "rules of the road" or navigation rules to be followed by ships and other vessels at sea in order to prevent collisions between two or more vessels. COLREGS can also refer to the specific political line that divides inland waterways (subject to one set of navigation rules) and coastal waterways (subject to international navigation rules).


Although rules for navigating vessels inland may differ, the international rules specify that they should be as closely in line with the international rules as possible. In continental Europe, the Code Européen des Voies de la Navigation Intérieure (CEVNI, or the European Code for Navigation on Inland Waters) apply. In the United States, the rules for vessels navigating inland are published alongside the international rules.