The cutter suction dredger is a combination of mechanical and hydraulic dredgers. To ensure the quality of underwater dredging depth (i.e., the flatness of the underwater seabed after dredging and the depth of the mud), it is necessary to use the steel piles and their lifting devices or the three-cable positioning device installed on the hull for positioning and the ship's forward and backward movement. The side-to-side swing of the hull is achieved by the two side-to-side anchors connected to the dredging winch bridge.