Sail & Rig Tuning, Ivar Dedekam. 63/4 x 91/2, 80pp. The best- illustrated manual ever on sail and rig tuning for small yachts and keelboats. Features 152 color diagrams and brilliantly concise text. Separate sections offer a logical approach to trimming genoas, mainsails, trimming spinnakers and setting up masts and stays.