Exposed Location Single Buoy Mooring (ELSBM) (a development of CALM) is designed for use in deep water where bad weather is common. With this type of SPM the buoy is replaced by a large cylindrical floating structure. The structure is surmounted by a helicopter platform, has reels for lifting hawsers and hoses clear of the water, and is fitted with emergency accommodation. Its anchors may lie up to half a mile from the structure.
FIG: Exposed Location Single Buoy Mooring (ELSBM)