 1/1A's mechanism support plates, some an inch (25 mm) thick, were made of aluminum alloy, but nevertheless, the computer is very heavy.On at least one refloated museum ship, the destroyer (now in Boston), the computer and Stable Element more than likely still are below decks, because they are so difficult to remove.The rangekeepers required a large number of electrical signal cables for synchro data transmission links over which they received information from the various sensors (e.g.