The invention provides a marine drive unit (1), such as an outboard motor, for a marine vessel, comprising: an engine or power plant (E), such as an internal combustion; a drive transmission for transmitting or transferring mechanical power generated by the engine or power plant (E) to a propeller shaft for generating propulsion for the vessel; a casing (3) that houses or at least partially encloses the engine (E) and/or the drive transmission; a mounting assembly (2) configured to mount the marine drive unit (1) to a hull, preferably to a transom, of the marine vessel; and a gyrostabiliser (4) arranged in or on the mounting assembly (2) or the casing (3). As an alternative to an outboard motor, the marine drive unit (1) may be provided as a stern drive unit or a pod drive unit. The invention also provides a marine vessel incorporating such a drive unit (1).

A stability controller includes a machine learning engine that outputs stabilizer settings to several on-board stabilizer systems of a vessel based on various inputs. The machine learning engine is first trained based on human selections of stabilizer system settings, and then, once suitably trained, the stability controller can be used to optimize the use and operation of the stabilizer systems as conditions change, based on a quantity or stability quality that the vessel operator desires to optimize.

A stability controller includes a machine learning engine that outputs stabilizer settings to several on-board stabilizer systems of a vessel based on various inputs. The machine learning engine is first trained based on human selections of stabilizer system settings, and then, once suitably trained, the stability controller can be used to optimize the use and operation of the stabilizer systems as conditions change, based on a quantity or stability quality that the vessel operator desires to optimize.

A gyroscopic stabiliser for stabilising motion of an object, the gyroscopic stabiliser comprising: a support for attaching to the object whose motion is to be stabilised; a gimbal rotatably supported by the support to be rotatable around a first axis relative to the support; and a flywheel rotatably supported by the gimbal to be rotatable around a second axis relative to the gimbal, the second axis being orthogonal to the first axis; wherein the gimbal is rotatably supported by the support at least partly within a maximum width of the gimbal along the first axis; and a maximum width of the gyroscopic stabiliser along the first axis is equal to, or substantially equal to, the maximum width of the gimbal along the first axis.

A gyroscopic stabiliser for stabilising motion of an object, the gyroscopic stabiliser comprising: a support for attaching to the object whose motion is to be stabilised; a gimbal rotatably supported by the support to be rotatable around a first axis relative to the support; and a flywheel rotatably supported by the gimbal to be rotatable around a second axis relative to the gimbal, the second axis being orthogonal to the first axis; wherein the gimbal is rotatably supported by the support at least partly within a maximum width of the gimbal along the first axis; and a maximum width of the gyroscopic stabiliser along the first axis is equal to, or substantially equal to, the maximum width of the gimbal along the first axis.

A system for orienting a marine vessel is provided. The system includes marine propulsion devices, a gyroscopic stabilizer system, and a manually operable control device configured to provide an output signal which is representative of a desired movement of the marine vessel. The system further includes a controller operably coupled to the marine propulsion devices, the gyroscopic stabilization system and the manually operable control device. The controller is configured to receive the output signal from the manually operable control device, resolve said desired movement of the marine vessel into a target movement command, operate the marine propulsion devices to exert a thrust on the marine vessel to achieve the target movement command, and operate the gyroscopic stabilizer system consistent with the thrust exerted by the plurality of marine propulsion devices to achieve the target movement command.

A system for orienting a marine vessel is provided. The system includes marine propulsion devices, a gyroscopic stabilizer system, and a controller operably coupled to the marine propulsion devices and the gyroscopic stabilization system. The controller is configured to control operation of the marine propulsion devices to minimize a control torque output of the gyroscopic stabilizer system while maintaining the marine vessel in a selected global position and/or heading.

A system for orienting a marine vessel is provided. The system includes marine propulsion devices, a gyroscopic stabilizer system, and a controller operably coupled to the marine propulsion devices and the gyroscopic stabilization system. The controller is configured to control operation of the marine propulsion devices to minimize a control torque output of the gyroscopic stabilizer system while maintaining the marine vessel in a selected global position and/or heading.

A gyroscopic boat roll stabilizer for a boat comprises a gimbal, having a gimbal axis, an enclosure mounted to the gimbal and configured to precess about a gimbal axis, a flywheel assembly rotatably mounted inside the enclosure for generating a torque that is applied to counter a rolling motion of the boat, and a braking system for controlling precession of the enclosure. The braking system is configured to enable precession in the first and second directions.

A gyroscopic boat roll stabilizer for a boat comprises a gimbal, having a gimbal axis, an enclosure mounted to the gimbal and configured to precess about a gimbal axis, a flywheel assembly rotatably mounted inside the enclosure for generating a torque that is applied to counter a rolling motion of the boat, and a braking system for controlling precession of the enclosure. The braking system is configured to enable precession in the first and second directions.