6 books
Chapmans PilotingAnnapolis book of Seamanship (Rousmaniere)The Complete Sailor (David Seidman)Piloting and Coastal Navigation (AE Saunders)Your favorite chandler's catalog (West Marine or other) for parts identificationYour own home made boat owners manual including the manuals for everything on board. I keep mine in a zipped binder. It has checklists for those rarely done routines like spring and fall decommissioning, crew overboard drills, VHF distress calling, specs and measures, etc.