Battery Box and Receiver Cover
I have a few yachts and a few motor boats but to date have not used a box to keep water out of the electrics. On occasion some items get wetted but dry out quickly without any problems. Only once has all my kit got wet, and that was when a motor boat sank whilst under power. A week later I rescued the boat from 7' deep water, removed all the electrics, took them to bits, dried them out (lightly oiled or greased where appropriate) and lo, everything worked again, no problem !😉