The rotary bow rudder system is based on the principle of the Magnus Effect. A differential pressure is generated through a fast rotating cylinder operating in the incoming water current, resulting in a thrust effect. This thrust effect or sideways-created steering power is larger than that of a conventional rudder. The rotary bow rudder system has been developed by A. Van der Velden, especially for inland vessels with large wind surface areas, such as vessels operating in light draught condition and pusher barge convoys. One or two retractable rotary bow rudders are located in a recess in the vessel bottom bow section. The system further includes a hydraulic unit for drive, a starter/electronic cabinet for steering control, and a control panel mounted in the wheelhouse.