We have a two pin 12V connection on our panel at the nav stn. It's kinda handy for testing bulbs and some other equipment, and I've cut off the 120/12V adapter for our handheld VHF charger and wired it in directly to the house bank there so we can charge the radio anytime.
We don't have any others on deck, exterior sources ought to have plugs and caps.
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"