A propulsion apparatus for watercraft, including a propulsion motor (M) supported by an upper case (10), a lower case (11) supported by the upper case so as to be rotatable around a steering axis, and rotatably supporting a drive shaft (22) for transmitting power from the propulsion motor to a propulsion device (13), a steering motor (30) received in the upper case, and a steering reduction gear mechanism (37) received in the upper case, wherein an output end (39) of the steering reduction gear mechanism or a part of a path of steering power transmission from the output end to the lower case is provided with a manual engagement member (57) which is configured to be engaged by a turning tool for manually turning the output end of the steering reduction gear mechanism.

A steering system for a marine drive includes a marine drive, wherein the marine drive is steerable about a steering axis, a steering actuator configured to steer the marine drive to a range of steering positions within a permitted steering range, a first steering sensor configured to sense the steering position of the marine drive and output a first sensed value, a second steering sensor configured to sense the steering position of the marine drive and output a second sensed value and a controller. The controller is configured to calculate a measured steering position for the marine drive based on the first sensed value and the second sensed value, and control the steering actuator based on the measured steering position.

A steering system for a boat configured to be installed on a steering axis of the boat, comprising one threading part for threading on the steering axis, a longitudinal adjustment part with an inner housing for the threading part, at least one longitudinal hole; a liner for the longitudinal adjustment part with a housing for the longitudinal adjustment part; a through hole to correspond to at least one longitudinal hole of the longitudinal adjustment part, at least one screw for its threading over at least one longitudinal hole of the longitudinal adjustment part such that a greater or lesser threading of the screw changes the relative position of the liner and the longitudinal adjustment part.

A watercraft includes a steering operator to be operated by a user to steer a watercraft, an operation amount sensor to detect an operation amount of the steering operator, a steering device including a steering actuator to change a steering angle, a steering angle sensor to detect the steering angle, and a steering controller configured or programmed to control the steering actuator according to an output signal of the operation amount sensor and an output signal of the steering angle sensor. The steering controller is configured or programmed to monitor the output signal of the steering angle sensor for an abnormality, feedback-control the steering actuator based on the output signal of the steering angle sensor to achieve a target steering angle when the abnormality is not detected, and feedforward-control the steering actuator based on the output signal of the operation amount sensor when the abnormality is detected.

A method for controlling a heading of a marine vessel having first and second trim tabs and at least one marine drive is provided. The method includes obtaining first and second deployments of the first and second trim tabs, obtaining a speed of the marine vessel, and determining an expected yaw value based on the first and second deployments and the speed of the marine vessel. The method further includes determining a steering angle compensation based on the expected yaw rate value, and controlling steering of the at least one marine drive based on the steering angle compensation.

A ship steering control device for controlling steering of a ship. The ship includes a ship propulsion device configured to generate a propulsion force of the ship and a manual operation unit for manually operating the ship propulsion device. The ship steering control device includes a manual steering controller, an automatic steering controller, an abnormality detection unit, and a steering mode switching unit. The manual steering controller is configured to control. The steering mode switching unit includes an automatic steering cancellation unit, a propulsion force gradual reduction controller, an operation position determination unit, and a manual steering start unit.

A steering control device for a marine vessel including a propulsion device to propel a hull, a steering wheel having a limited rotatable angle, and a steering actuator to change a turning angle of the propulsion device, includes a controller configured or programmed to determine, based on an acquired rotation angle position of the steering wheel, whether the steering wheel is stopped, and to control, during a control to shift the steering mode from an automatic steering mode to a normal steering mode, the steering actuator to reduce a deviation between a turning angle corresponding to the acquired rotation angle position of the steering wheel and an acquired actual turning angle of the propulsion device if the steering wheel is stopped.

A boat helm assembly includes a right first helm member and a left second helm member. The right first helm member is manufactured via rotational molding. The right first helm member comprises a body member comprising a plurality of interconnected walls coupled via elongated edges to define an internal compartment that includes an aperture into which a steering shaft. The body member includes sidewalls, a top first wall, and a bottom second wall, the sidewalls include a front first sidewall with at least one kiss off joint transferring loads. The front first sidewall supports a steering apparatus and is substantially parallel to a forwardly oriented recess wall of the bottom second wall. The front first sidewall and the forwardly oriented recess wall are provided with aligned mounting apertures shaped and dimensioned to accommodate a wide variety of the steering assemblies.

A marine vessel including a steering mechanism that includes a steering wheel including shift switches to cause the marine vessel to shift to a course holding mode to hold a course of the marine vessel, and a traveling direction maintaining mode to maintain a traveling direction of the marine vessel.