Even though some you you that sail in salty water may not consider Great Lakes sailing as "off shore", many of our regatta races are distance races that take us 5-10 or more miles off shore. Thus, sailing a 25+ year old boat, we error on the side of caution.
In addition to carrying the red Yanmar tool kit, we have on board at all times a tool kit that includes, hammer, cresent wrench, long blade flat head screw driver (mostly there as a pry bar, regular lenght flat head screw driver, two phillips head screw drivers, needle nose pliers, waterpump pliers, wire stripper/cutter,portable hack saw, a complement of box/socket head wrenches, duck tape, rigging tape, electrical tape, wd-40 pop rivit gun, whipping line, needles, electrical connectors, spare shackles, wire ties, light bulbs, fues, assorted screws and nuts, a knife, etc, etc.
On overnight races, we also carry a bolt cutter (capable of cutting through the standing rigging)