Includes firms engaged in making the products that are used to protect marine environment from fabrics and plastic, such as, silt curtains to contain dredging silt and turbidity, oil booms for oil spills and chemicals, debris barriers for rubbish and seaweeds, it also involves demarcation barriers for designating swimming and boating areas and for protection from jellyfish, as well as navigation buoys and beacons to identify navigation channels.