Compass and GPS. Flashlight and headlamp. Marine VHF radio and flares if you are out on big water. Bailer. Seat cushion. Anchor and line. Boat hook. Duck ID guide.
DRAG anchor...for big water, dead motor, and bad weather, keeping the bow into the wind can be first priority. Spud pole. Some chem lights in red, green, and white ain’t a bad idea either. A rod for knocking out the stuck squib wad or cleaning the mud out of your barrel after your swims, can be handy. Fire starter. Spanish brandy.