Do you need crewmen in the control room to turn the rudder? Maybe something in the .upc files is messing with your functionality?
Better check and make sure the rudder is there, too
, although I don't know if the game would care if you had a rudder or not. It sure doesn't mind the entire backside of a ship being blown to h-e-double-hockey-sticks and the boat keep right on "trucking" across the ocean.