Collisions are expensive! Learning, understanding and remembering the International Regulations for Preventing Collisions at Sea (COLREGs) is essential for anyone venturing onto the water. This book is aimed at yachtsmen but will also be useful to professional mariners. Paul Boissier explains the intention of each rule and how it should be applied when at sea. It is the perfect companion when studying for any nautical exam. It also contains the COLREGs in full. There are plenty of quirky tips on how to remember the various rules, and test sections allow readers to check their comprehension and act as perfect aids to revision. Anecdotes and explanations help clarify the rules and make this a very readable book. If you need to pass an exam, require an on-board reference, or wish to improve your understanding of the nautical rules of the road, this is the ideal book for you.