Over and above the basic requirements of flares and PFDs (worn not stowed); we wear personal locators, whistle, light and as Caapi suggests a knife. If the weather is poor we wear Mustang flotation bibs and jackets; if the world goes to shyte we have Mustang dry suits. (I like to wear it like a sleeping bag while on
deck, LOL). Our
boat is equipped with an
epirb and lifeboat. Our (floating and waterproof) ditch bag contains hand held
GPS,
VHF,
batteries, dried
food bars and (bagged) fresh water, thermo blankets, 1st aid kit and a
Katadyn Survivor. We also keep emergency food, water,
radio, 1st Aid Kit in our dingy chain locker.
Stuff is good, but filing a float plan and understanding your boat and its limitations is just as important. Keeping in touch with a Cruiser's Net is also good along with the daily tasks of checking boat systems (IE,
equipment, hoses, through hulls, clamps,
oil and batteries). Keep your radio(s) on and
monitor them; it could save your life or someone elses'.