an elevator levelling / hatch control circuit including a motor controller , elevator dispatching unit , an elevator location sensing unit , and a control unit . the control unit receives hatch position signals , monitors the speed and direction of elevator motion and generates hatch open / close commands and elevator speed and direction commands to assure safe elevator operation in a shipboard environment . in one embodiment the circuit utilizes miniature electromechanical relays that may be visually monitored and easily tested .