The basic design by Wärtsilä-IMS takes into account the specialised needs involved for the construction of offshore wind farms. The vessels are 100 metres long and 40 metres wide, and feature an 800-ton crane for transporting and handling the foundations for the latest generation of up to 5MW and 6 MW offshore wind turbines, as well as the turbine towers, nacelles, rotors and blades. The vessels have sufficient deck area and deadweight capacity to carry the components for up to four complete wind turbine units or several foundations. For operation in shallow water, a four-point mooring system is used, while in deeper waters a DP2 dynamic positioning system controlling steerable thrusters is employed.