Wow! I've never been able to rotate or elevate the deck gun without the gun crew being there when firing it myself. I have on the rare occasion managed to damage or sink an unarmed ship in inclement weather by manoeuvring at very close range relative to where the crew left the deck gun pointing, and then timing the firing with the roll of the boat to get the correct elevation. Desperate measures!

There is a Time delay tab in the OFEV that puts a delay between the surfaced/submerged state of the boat but I've never found the right setting to keep the deck or flack gun crews at their posts in rough seas!