The definitive, trusted guide to the rules, used by the largest maritime and naval institutions worldwide, now revised to reflect the 2009 amendment to the International Collision Avoidance Regulations. It is the essential reference to the safe operation of all vessels at sea. This book sets out the 'COLREGs' with clear explanation of their meaning and gives detailed examples of how they have been used in practice by seafarers, as well as excerpts from court judgments to illustrate their legal interpretation.