Lloydâs Register releases new Rules, Class Notation and Guidance Notes for âWind Turbine Installation and Maintenance Vessels and Liftboatsâ to reflect industry best practice and new novel designs. The new Rules form part of the wider Mobile Offshore Unit Rule set 2013 launched by Lloydâs Register in June, and is for vessels engaged in installation and/or maintenance activities relating to offshore wind turbines. It covers a number of unit types as well as liftboats, whose primary function is to provide support services to offshore wind turbine installations or other types of offshore installation. Vessels which comply with the requirements of the new Rules will be eligible for a new classification notation (MainWIND).