Abstract: A navigation control system includes an obstacle detector on a hull to detect a distance from a hull to an obstacle on a water surface and a position of the obstacle, a thruster on the hull to generate a propulsive force, a steering to steer the thruster to right and left sides of the hull, and a controller configured or programmed to perform a control to determine an obstacle avoidance route based on a route function including at least an indicator of a lateral acceleration that acts on the hull during steering of the thruster when the obstacle is detected by the obstacle detector.

Abstract: A marine propulsion system includes a controller configured or programmed to perform a marine vessel traveling direction control such that a traveling direction of a marine vessel is changed to a predetermined angle equal to or greater than a first angle with respect to a traveling direction of waves toward the marine vessel when the traveling direction of the marine vessel is less than the first angle with respect to the traveling direction of the waves toward the marine vessel.

Abstract: A marine vessel maneuvering system includes a controller configured or programmed to perform a water entry determination control to determine whether or not water behind a hull that rises above a water surface due to deceleration of the hull may enter the hull when the hull is decelerating.

Abstract: In a boat including a hull, when the hull is moved laterally based on an output from the outboard motor, the hull rolls, which may cause discomfort to a user or passengers. To compensate for this, a lateral movement control method for the boat including the hull and the outboard motor includes generating a propulsion force to laterally move the hull with the output of the outboard motor, and executing a roll reduction process to reduce a roll angle of the hull at a time of laterally moving the hull.

Abstract: An apparatus for judging presence or absence of an abnormality of a marine vessel includes a controller configured or programmed to function as an estimating unit to estimate a marine vessel speed and a pitch angle of a hull of the marine vessel based on a propulsion force of a marine vessel propulsion device and an attitude of the marine vessel propulsion device and a judging unit, and a measuring unit to measure an actual marine vessel speed and an actual pitch angle. The judging unit judges the presence or absence of the abnormality based on at least one of a comparison result between the estimated marine vessel speed estimated by the estimating unit and the actual marine vessel speed measured by the measuring unit or a comparison result between the estimated pitch angle estimated by the estimating unit and the actual pitch angle measured by the measuring unit.

Abstract: A marine vessel includes a hull, left and right propulsion devices attached to a stern of the hull, left and right drive units to change a rotation angle of the left and right propulsion devices about left and right tilt shafts, and to set an angle at which a position of a lower portion of the left and right propulsion devices becomes highest as a maximum rotation angle, left and right lift mechanisms to change a vertical position of the left and right propulsion devices with respect to the hull, and a controller configured or programmed to function as a judging unit to judge whether or not a displacement in a roll direction of the hull has occurred, and a control unit to control the left and right drive units and the left and right lift mechanisms.

Abstract: A steering control apparatus for a marine vessel that is able to automatically reduce chine walk includes a processor to obtain behavior information on a hull, including one or more of a behavior relating to a shift of the hull in a roll direction, a shift of the hull in a yaw direction, a shift of the hull in crosswise direction, a steering load, and a helm operation load. When judging that one or more conditions to change a steering mode to a counter steering mode are satisfied, the processor changes the steering mode to the counter steering mode. In the counter steering mode, the processor controls steering of the marine vessel by performing counter steering so as to reduce at least some of one or more of the behaviors of the hull based on the obtained behavior information.

Abstract: A controller is configured or programmed to obtain at least either of a pitch angle of a watercraft and an angular velocity of the pitch angle, obtain a present thrust of an outboard motor, and set a target thrust of the outboard motor based on the present thrust of the outboard motor and at least either of the pitch angle of the watercraft and the angular velocity of the pitch angle. The controller is configured or programmed to control a drive source such that a thrust of the outboard motor becomes the target thrust.

Abstract: A system includes an outboard motor, an actuator, a sensor, and a controller. The sensor detects motion information indicating an up-and-down directional motion of a bow of a watercraft. The controller is configured or programmed to selectively set either a trim-up direction or a trim-down direction as a trim direction in accordance with the up-and-down directional motion of the bow based on the motion information. The controller is configured or programmed to control the actuator to cause the outboard motor to perform a trim motion in the trim direction, and to set a duration of the trim motion to be different between when the outboard motor is caused to perform the trim motion in the trim-up direction and when the outboard motor is caused to perform the trim motion in the trim-down direction.

Abstract: A system includes an outboard motor including a lift actuator, a pitch angle sensor, a lift position sensor, and a controller configured or programmed to obtain at least either of a pitch angle of a watercraft and an angular velocity of the pitch angle. The controller is configured or programmed to obtain a lift position of the outboard motor, and controller selectively set either a lift-up direction or a lift-down direction as a lift direction based on the lift position of the outboard motor and at least either of the pitch angle of the watercraft and the angular velocity of the pitch angle. The controller is configured or programmed to control the lift actuator to cause the outboard motor to perform a lift motion in the lift direction.

Abstract: A system includes an outboard motor, an actuator, a pitch angle sensor, a trim angle sensor, and a controller to obtain at least either of a pitch angle of a watercraft and an angular velocity of the pitch angle, and to obtain a trim angle of the outboard motor. The controller is configured or programmed to selectively set either a trim-up direction or a trim-down direction as a trim direction based on the trim angle of the outboard motor and at least either of the pitch angle of the watercraft and the angular velocity of the pitch angle. The controller is configured or programmed to control the actuator to cause the outboard motor to perform a trim motion in the trim direction.

Abstract: A system includes an outboard motor, a lift actuator, a sensor, and a controller. The sensor detects motion information indicating an up-and-down directional motion of a bow of a watercraft. The controller is configured or programmed to selectively set either a lift-up direction or a lift-down direction as a lift direction in accordance with the up-and-down directional motion of the bow based on the motion information. The controller is configured or programmed to control the lift actuator to cause the outboard motor to perform the lift motion in the lift direction, and set a duration of the lift motion to be different between when the outboard motor is caused to perform the lift motion in the lift-up direction and when the outboard motor is caused to perform the lift motion in the lift-down direction.

Abstract: A posture control system for a hull includes a movable posture control plate. An outboard motor is attached to the hull and is movable with respect to the hull. A controller is configured or programmed to control movement of the posture control plate and movement of the outboard motor so as to control the posture of the hull.

Abstract: An outboard motor includes an engine, a drive shaft, and a shift shaft disposed forward of the drive shaft. The shift shaft includes a first shift shaft that extends in an upward-downward direction, a second shift shaft disposed below the first shift shaft and spaced apart from and rearward of the first shift shaft, the second shift shaft extending in the upward-downward direction, and a shift force transmission to transmit, to the second shift shaft, a shift force applied to the first shift shaft.

Abstract: An outboard motor includes an engine, a propeller shaft that rotates together with a propeller and extends in a forward-rearward direction, and a lower case that houses the propeller shaft. The lower case includes a front case and a rear case separate from the front case and positioned rearward of the front case, and the front case and the rear case are assembled to each other.

Abstract: An engine includes a crankshaft extending in a vertical direction. A drive shaft is connected to the crankshaft and coaxial with the crankshaft. A water intake passage is connected to the engine. A water pump is connected to the water intake passage. The water pump includes a pump shaft. The pump shaft is eccentrically mounted with respect to the drive shaft and parallel or substantially parallel to the drive shaft. The pump shaft rotates according to rotation of the drive shaft.

Abstract: A posture control system for a hull includes a movable posture control plate. An outboard motor is attached to the hull and is movable with respect to the hull. A controller is configured or programmed to control movement of the posture control plate and movement of the outboard motor so as to control the posture of the hull.

Abstract: When a shift member is in a first position, a first clutch couples a second drive shaft to a first drive shaft. When the shift member is in the first position, a second clutch decouples a first gear from the first drive shaft. When the shift member is in the first position, a third clutch decouples a second gear from the second drive shaft.

Abstract: A steering control apparatus for a marine vessel that is able to automatically reduce chine walk includes a processor to obtain behavior information on a hull, including one or more of a behavior relating to a shift of the hull in a roll direction, a shift of the hull in a yaw direction, a shift of the hull in crosswise direction, a steering load, and a helm operation load. When judging that one or more conditions to change a steering mode to a counter steering mode are satisfied, the processor changes the steering mode to the counter steering mode. In the counter steering mode, the processor controls steering of the marine vessel by performing counter steering so as to reduce at least some of one or more of the behaviors of the hull based on the obtained behavior information.

Abstract: An outboard motor includes an engine, a propeller shaft that rotates together with a propeller and extends in a forward-rearward direction, and a lower case that houses the propeller shaft. The lower case includes a front case and a rear case separate from the front case and positioned rearward of the front case, and the front case and the rear case are assembled to each other.