What every boat needs??

[CHANCE1234]

Just thought I would throw this out there to see what everyone else considers must haves while underway. I thought maybe this would be a good information source for people to share their inovative ideas, or best practices. So far I have ready a good tool kit with adjustables, tape measure, various wrenches, duct tape, electrical tape, pliers, spark plugs, nail clippers, various sockets, fuses, various nuts, bolts, washers, spare belts, flash light. I was wondering what you guys have for damage control gear. Or other things people would not leave home with out.