A control system for a marine vessel that includes a drive source and an operator that receives an operation is able to switch a control mode of the drive source without providing an additional operator. An operation received by the operator when the drive source is resting is disabled, and a function of switching a control mode of the drive source is assigned to the operation of the operator that is received when the drive source is resting.

A recovery device for an unmanned underwater vehicle (UUV) includes a first recovery component arranged on an unmanned ship and a second recovery component arranged on the UUV. Two magnets are provided on an end of the first recovery component and an end of the second recovery component which are opposite to each other, respectively. A first cable of the unmanned ship is provided on an end of the first recovery component away from the magnet, and a second cable is provided on an end of the second recovery component away from the magnet. A thruster is provided on a side of the first recovery component. The UUV is recovered using the unmanned ship through the recovery components connected to the cables, which allows the locating and navigation errors to a large extent.

A recovery device for an unmanned underwater vehicle (UUV) includes a first recovery component arranged on an unmanned ship and a second recovery component arranged on the UUV. Two magnets are provided on an end of the first recovery component and an end of the second recovery component which are opposite to each other, respectively. A first cable of the unmanned ship is provided on an end of the first recovery component away from the magnet, and a second cable is provided on an end of the second recovery component away from the magnet. A thruster is provided on a side of the first recovery component. The UUV is recovered using the unmanned ship through the recovery components connected to the cables, which allows the locating and navigation errors to a large extent.

A personal watercraft (PWC) is provided. The PWC includes a body having a bottom portion, a top portion covering the bottom portion, and a storage space disposed between the top and bottom portions; and a power train disposed on or in the body. The power train includes a motor, a battery, a controller, an impeller, and an impeller water pump, and is configured for moving the body through water. Further, the body and the power train collectively weigh about 150 pounds or less.

A personal watercraft (PWC) is provided. The PWC includes a body having a bottom portion, a top portion covering the bottom portion, and a storage space disposed between the top and bottom portions; and a power train disposed on or in the body. The power train includes a motor, a battery, a controller, an impeller, and an impeller water pump, and is configured for moving the body through water. Further, the body and the power train collectively weigh about 150 pounds or less.

A watercraft includes a jet propulsion system having a venturi unit and an impeller. The impeller is rotatable in a forward direction for propelling water rearward out of the venturi unit, and a reverse direction for propelling water forward through the venturi unit. A bailer-siphon system of the watercraft includes a fluid conduit defined in part by a valve, the fluid conduit having a fluid inlet in the motor compartment and a fluid outlet at the venturi unit. The valve is operable between an open position in which the valve fluidly connects the fluid inlet to the fluid outlet, and a closed position in which the valve fluidly disconnects the fluid inlet from the fluid outlet. The valve is in the open position when the impeller rotates in the forward direction. The valve is in the closed position when the impeller rotates in the reverse direction.

A watercraft includes a jet propulsion system having a venturi unit and an impeller. The impeller is rotatable in a forward direction for propelling water rearward out of the venturi unit, and a reverse direction for propelling water forward through the venturi unit. A bailer-siphon system of the watercraft includes a fluid conduit defined in part by a valve, the fluid conduit having a fluid inlet in the motor compartment and a fluid outlet at the venturi unit. The valve is operable between an open position in which the valve fluidly connects the fluid inlet to the fluid outlet, and a closed position in which the valve fluidly disconnects the fluid inlet from the fluid outlet. The valve is in the open position when the impeller rotates in the forward direction. The valve is in the closed position when the impeller rotates in the reverse direction.

A novel emissions control watercraft (STAXcraft) solving a long-felt but unsolved need regarding disadvantages associated with prior-art emissions servicing watercraft, the disadvantages selected from the group, but not limited to, the use of tugboats, securing or mooring servicing watercraft to a serviced vessel, additional expenses and time-delays and inefficiencies of land-based approaches, increased toxic emissions, increased greenhouse gases (GHG) emissions, danger from falling cargo, tanker safety, alongside mooring in narrow channels preventing other OGV's to pass safely, and cargo tank emissions.

A novel emissions control watercraft (STAXcraft) solving a long-felt but unsolved need regarding disadvantages associated with prior-art emissions servicing watercraft, the disadvantages selected from the group, but not limited to, the use of tugboats, securing or mooring servicing watercraft to a serviced vessel, additional expenses and time-delays and inefficiencies of land-based approaches, increased toxic emissions, increased greenhouse gases (GHG) emissions, danger from falling cargo, tanker safety, alongside mooring in narrow channels preventing other OGV's to pass safely, and cargo tank emissions.

An underwater ROV or AUV with 8 vectored thrusters that provides a high degree of dynamic stabilisation, 6-degrees of freedom, and a system to control an underwater ROV or AUV with single or multiple thruster failures. In addition, the ROV/AUV has a system to minimise silt disturbance when operating close to fine silt or sensitive environments.