Mooring causes damage which can be reduced by using mooring buoys. Mooring is often accomplished using thick ropes called "mooring lines" or "hawsers". Examples include quays, wharfs, jetties, piers, anchor buoys, and mooring buoys. There is room for several boats at anchor or at a mooring buoy. A dock and a small boat mooring basin are available. The swivel enables an offloading tanker to rotate with respect to the mooring buoy. The case concerned a barge that had broken her mooring with the dock. The holes were also used for belaying mooring lines and sail sheets. It navigates using anchors with 10 point mooring system. Some ships use wire rope for one or more of their mooring lines. As a verb, "mooring" refers to the act of attaching a vessel to a mooring. There are facilities for mooring narrowboats at its terminus at Ashton-on-Ribble. Today Gravesend Canal Basin is used for the mooring of pleasure craft. Limited only by the maximum length of the mooring cable. It can also be used as a mooring knot.