Category I brackets automatically deploy the EPIRB they secure once they sink to between 4 feet and 13 feet underwater. They're designed to withstand sun and sea. Boats often roll upside down before they sink, so avoid areas that might trap the beacon as it floats free. The best spot might be atop the hardtop (4) where it can be retrieved from the cockpit for manual activation. The foredeck (5) is good, but you may need to go forward in a sea to manually activate it, if required. In either case, mount it near the centerline of the boat where the bracket sinks deeper if the boat rolls. If you remove your beacon to prevent theft, spend $50 for an extra Category II bracket so it can't transmit if it gets wet.