Summer boat packing checklist Life jackets for all passengers First aid kit and emergency supplies Flares, whistle, and signalling devices Navigation tools (GPS/maps) Marine radio or communication device Sunscreen, hats, and sunglasses Water, snacks, and cooler Dry bags, towels, and spare clothing Fishing gear (optional) Water toys and inflatables Spare engine oil & spark plugs Propeller hardware and fuel filters Dock lines, anchor, and fenders