Boat based Survival Kit Recommendations?

The boat is a 30 foot Pursuit Sportender. Here's What I already have:Basic ToolboxTackleboxFishing PoleShovelHandsawCrab trapThis plus all the standard stuff people have on boats, like rope, beer, water, and canvas covering. There's a whole load of other smaller stuff as well not worth mentioning.What else should I add to make survival more viable in the event of a breakdown or beaching? I'm assuming that if conditions are so bad that I'm thrown from the deck then I'm already dead. http://ift.tt/2fXrYKE