This is an A--Z for multihull sailors. There are many textbooks on the market which detail general seamanship principles. This is not one of them. Multihull seamanship is about catamarans and trimarans and the skills needed to understand and enjoy them to their utmost. Both racing and cruising yachts are catered for, as are trailerable multihulls. Seamanship is not a black and white skill. It is an evolution of knowledge; a building of information through experiment, thought and experience. There is no definitive word on an evolving skill. Multihull seamanship started as Dr Gavin's LeSueur's personal index of a how--to's. It has grown through experience and others sharing their knowledge. It should be on the book shelf of every catamaran and trimaran.