This bulletin documents those features of SWATH ships judged to be of importance of prospective SWATH ship owners and designers. The basis for this document is the information available for the SWATH ships produced as well as the supporting technology. The information provided forms a basis for assessing the capabilities and limitations of the SWATH concept as well as providing an overview of SWATH technology. The overall design of SWATH ships as well as major topics such as structures, loads, machinery, and hydrodynamic performance are discussed in general terms to provide a general understanding of them. A more detailed treatment of these subjects is available through the more specialized technical literature indicated by the references.