Defence analysts see Mangrol-class craft as a layered answer to that risk. Deep-sea platforms such as frigates, helicopters and maritime patrol aircraft cover the open ocean. Shallow-water craft cover the final approaches to harbours, anchorages and naval bases, where an intruding boat must slow down, hug the coast and become easier to detect. A numerous fleet of such ships, built to patrol these waters continuously, helps close that gap. Mangrol alone will not do so, but the class is meant to work as a network.