For improving safety and stability, a pontoon boat has installed on the pontoon tubes, extra volume to create extra buoyancy. The extra volume is installed on the front and on the rear of the pontoon tubes. Under the pontoon tubes there are installed water jets that create trust in multiple directions. Also for improving the stability of the pontoon boat, ballast water is used.

A jet propulsion boat includes: a boat body; a jet water stream generation device that jets a jet water stream from the boat body to impart a propulsion force in a front-rear direction to the boat body; a steering device including a steering operator operated by a driver, and changes an orientation in a lateral direction of a propulsion force of the jet water stream generation device in response to an operation on the steering operator; an auxiliary propulsion device provided on the boat body to impart a propulsion force in a lateral direction to the boat body; and a control device that controls the auxiliary propulsion device based on an operation of the steering device.

A jet propulsion boat includes: a boat body; a jet water stream generation device that jets a jet water stream from the boat body to impart a propulsion force in a front-rear direction to the boat body; a steering device including a steering operator operated by a driver, and changes an orientation in a lateral direction of a propulsion force of the jet water stream generation device in response to an operation on the steering operator; an auxiliary propulsion device provided on the boat body to impart a propulsion force in a lateral direction to the boat body; and a control device that controls the auxiliary propulsion device based on an operation of the steering device.

An underwater detection device includes a surface drive boat and an unmanned underwater vehicle. The surface drive boat includes: a hull; transverse attitude-stabilizing thrusters and orbit vectored thrusters arranged at the bottom of the hull; a control box arranged on the hull and electrically connected with the transverse attitude-stabilizing thrusters and the orbit vectored thrusters; a cable and a cable winding assembly arranged on the hull, the control box being connected with the unmanned underwater vehicle by the cable, the cable winding assembly being electrically connected with the control box; and a positioning assembly arranged on the hull and electrically connected with the control box.

An underwater detection device includes a surface drive boat and an unmanned underwater vehicle. The surface drive boat includes: a hull; transverse attitude-stabilizing thrusters and orbit vectored thrusters arranged at the bottom of the hull; a control box arranged on the hull and electrically connected with the transverse attitude-stabilizing thrusters and the orbit vectored thrusters; a cable and a cable winding assembly arranged on the hull, the control box being connected with the unmanned underwater vehicle by the cable, the cable winding assembly being electrically connected with the control box; and a positioning assembly arranged on the hull and electrically connected with the control box.