Well, er thanks. Not sure anyone is spot on yet. The boat started its life and was outfitted in Florida as a sport fisher. There are three of these whatever they ares, all in the cockpit. No one I have met on the west coast has seen anything like them. So I'm guessing its a Florida fishing thing? Here is a different angle pic.
Thanks everybody. I don't know if we are getting closer to an answer. The cockpit is 15 by 8 and has a fairly large cover already. These are flat into the deck with no angle. Two are directly in line fore and aft, about 4 feet apart, the other one is almost to the wall on the port side.