Several embodiments of remote control operators for adjusting the trim of a pair of marine propulsion devices. Each control system is designed so as to permit selective trim adjustment of either of the propulsion devices independently of the other and regardless of its trim adjusted position or for permitting simultaneous adjustment of both of said propulsion devices. A number of different types of circuits are illustrated for accomplishing this result and the adjusted propulsion devices may comprise either an outboard motor, the outboard drive of an inboard/outboard drive or the screws of a twin screw inboard drive.