The International Regulations for Preventing Collisions at Sea (COLREGS) are vital for maritime safety. You must be able to identify vessels during the day by their special shapes, and at night time by their lights, and understand how they are likely to alter course or speed in a potential collision situation.

Melanie Bartlett's book provides a clear and authoritative explanation of each regulation. It is fully illustrated and will help any seafarer understand their responsibilities, meaning that everybody at sea will be safer.