MARINE VESSEL PROPULSION SYSTEM AND METHOD, COMMUNICATION TERMINAL, AND KEYCODE SERVER

A marine vessel propulsion system (100) includes a propulsive force generator (31) to generate a propulsive force, a drive source (32) to drive the propulsive force generator (31), and a controller (5) configured or programmed to control the drive source (32) to perform marine vessel maneuvering-related functions including at least one limited function. The controller (5) includes an interface (53), and is further configured or programmed to include a restriction unit (21) to restrict a control operation for the limited function, and a restriction cancellation unit (22) to cancel the restriction effected by the restriction unit (21) to permit the control operation for the limited function if a predetermined keycode is inputted from the interface (53) or is registered in the controller (5).