Mooring Buoys are used to keep one end of a mooring cable or chain on the water's surface so that ships or boats can tie on to it. The two preferred designs for mooring buoys are a traditional buoy with hardware or a buoy with a tube through the center. Both offer reliable flotation and will last for several seasons, depending upon the salinity of the water. A permanent mooring system, when properly designed, should securely position a boat so that it can be left unattended, with little attention, for long periods of time. A mooring system usually consists of a mooring buoy (to float the chain), a mooring anchor and a length of chain (running between the anchor and the mooring buoy). Also the proper ground tackle includes correct sized galvanized shackles and swivels.