Since the early sixties, the Catenary Anchor Leg Mooring (CALM) buoy has been a successful system for exporting the oil from the production platform to the shuttle tanker. In the beginning CALM buoys were used in relatively shallow water at near shore locations, often in very harsh wave conditions. Nowadays CALM buoy’s can be used in any offshore location. For example, the West of Africa, Gulf of Mexico, North Sea and even in arctic conditions CALM buoys are used.