4.Exceptions
The gross tonnage of vessels whose form or constructional features are such as to render the application of these formulae unreasonable or impracticable (catamarans, trimarans and other vessels of novel design) shall be determined by the administration of the Member State concerned. Where the tonnage is so determined, the administration shall communicate to the Commission details of the method used for that purpose. These will be made available for examination by other Member States.