A book worth having for any sailor, if you can keep track of what he's trying say as it jumps around a bit. The weather section is probably the most valuable, hence worth reading and understanding thoroughly.

A yacht is a yacht, whether it's got two hulls or one. Certain principles apply to all yachts (lift, drag, resistance, righting moment, etc.), you'll just have to think a bit laterally to apply the ideas to cats.