Old as Dirt!
Join Date: Nov 2008
Location: Tampa Bay Area
Thanked 155 Times in 147 Posts
Rep Power: 9
It is a 1970's era "twist-lock" DC power outlet. Search the boat. You are likely to find the mating plug somewhere aboard.
Having a DC outlet in the cockpit can be very handy although I disagree with installing a cigarette lighter style if you cannot find the original twist-lock plug as they are prone to becoming unplugged at most inconvenient times and they invariably leak. A waterproof dual prong plug has much to recommend it as an alternative.
"It is not so much for its beauty that the sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."