Control device for propelling system

A control device for a propelling system of a vessel comprising:

• a manual sailing control unit configured to control a revolution speed of a propeller included in a propelling system, a posture of the propelling system and a rotational direction of the propeller based on a signal inputted from a controlling device for instructing the revolution speed, the posture and the rotational angle;
• a positional information acquisition unit configured to acquire positional information of a hull to which the propelling system is attached;
• a determination unit configured to determine, based on the positional information and information on a specific water area where the sailing is limited, whether the hull stays within the specific water area or there is a possibility that the hull enters the specific water area;
• and
• an automatic sailing control unit configured to automatically sail the hull by controlling the revolution speed, the posture and the rotational direction if it is determined that the hull stays within the specific water area or there is a possibility that the hull enters the specific water area.