Disclosed is a tool for watercraft fin insertion and removal. The tool includes: a first external elongated layer, a second external elongated layer, aligned with, and positioned at a substantially parallel plane to the plane of, the first external layer. An internal layer is positioned between, and stretches across a portion of the area of, the external layers. Upon positioning the tool such that the inner surfaces of the external layers are adjacent to the outer surfaces of the watercraft fin, a curved fin engagement elements on the edge of the internal layer, complements at least a portion of the leading edge or the trailing edge of the watercraft fin.

A steering system for a vessel includes an electric actuator that generates power to rotate a steering wheel, a transmitting mechanism that transmits a rotation of the electric actuator to the steering wheel, and a power supply controller that supplies electric power to the electric actuator according to an input signal that is not based on a rotation of the steering wheel.

A steering system for a vessel includes an electric actuator that generates power to rotate a steering wheel, a transmitting mechanism that transmits a rotation of the electric actuator to the steering wheel, and a power supply controller that supplies electric power to the electric actuator according to an input signal that is not based on a rotation of the steering wheel.

Arrangement and method for manoeuvring a vessel that is towing a load. The vessel has a block at the aft end, over which at least one tow line extends. The block is moveable transverse to the longitudinal axis or longitudinally of the vessel. The position of the moveable block defines a point of attack for a tension force from the tow line. An autopilot is coupled to an actuator moving said block, in order to change the moment of force about a rotation point of the vessel. The autopilot has a calculation unit, which detects the tension force (W1, W2) and calculates the moment of force on the vessel. The autopilot can thus use a change in said moment of force to manoeuvre the vessel.

Arrangement and method for manoeuvring a vessel that is towing a load. The vessel has a block at the aft end, over which at least one tow line extends. The block is moveable transverse to the longitudinal axis or longitudinally of the vessel. The position of the moveable block defines a point of attack for a tension force from the tow line. An autopilot is coupled to an actuator moving said block, in order to change the moment of force about a rotation point of the vessel. The autopilot has a calculation unit, which detects the tension force (W1, W2) and calculates the moment of force on the vessel. The autopilot can thus use a change in said moment of force to manoeuvre the vessel.

A rudder assembly, including a steering engine; an axial hollow rudder stock; a rudder blade; a gas release unit; and a tiller. The steering engine is disposed in a vessel stern. The tiller is connected to the steering engine. The axial hollow rudder stock includes a through hole. The through hole is small and disposed along the axis of the axial hollow rudder stock. The gas release unit is disposed in the vessel stern, and includes a control cabinet. The control cabinet includes a reagent storage tank, a reagent conveying hose connected to the reagent storage tank, a compressed air bottle, a pressure hose connected to the compressed air bottle, and a console. The pressure hose and the reagent conveying hose pass through the through hole of the axial hollow rudder stock, and then communicate with the cavity of the rudder blade.

A rudder assembly, including a steering engine; an axial hollow rudder stock; a rudder blade; a gas release unit; and a tiller. The steering engine is disposed in a vessel stern. The tiller is connected to the steering engine. The axial hollow rudder stock includes a through hole. The through hole is small and disposed along the axis of the axial hollow rudder stock. The gas release unit is disposed in the vessel stern, and includes a control cabinet. The control cabinet includes a reagent storage tank, a reagent conveying hose connected to the reagent storage tank, a compressed air bottle, a pressure hose connected to the compressed air bottle, and a console. The pressure hose and the reagent conveying hose pass through the through hole of the axial hollow rudder stock, and then communicate with the cavity of the rudder blade.

A steering system for a marine vessel comprises a helm, a control head, and a joystick. The helm and control head may respectively provide user inputted steering commands and user inputted shift and throttle commands on a first CAN network. The joystick and the control head may respectively provide user inputted steering commands and user inputted shift and throttle commands on a second CAN network. The helm may provide user inputted steering commands on the first CAN network. The control head may provide user inputted shift and throttle commands on the second CAN network. The joystick may provide user inputted steering commands and user inputted shift and throttle commands on either the first CAN network or the second CAN network.

A steering system for a marine vessel comprises a helm, a control head, and a joystick. The helm and control head may respectively provide user inputted steering commands and user inputted shift and throttle commands on a first CAN network. The joystick and the control head may respectively provide user inputted steering commands and user inputted shift and throttle commands on a second CAN network. The helm may provide user inputted steering commands on the first CAN network. The control head may provide user inputted shift and throttle commands on the second CAN network. The joystick may provide user inputted steering commands and user inputted shift and throttle commands on either the first CAN network or the second CAN network.

A steering system for a vessel includes an electric actuator that generates power to rotate a steering wheel, a transmitting mechanism that transmits a rotation of the electric actuator to the steering wheel, and a power supply controller that supplies electric power to the electric actuator according to an input signal that is not based on a rotation of the steering wheel.