These Guidelines have been developed for the design and construction of new offshore supply vessels with a view to promoting the safety of such vessels and their personnel, recognizing the unique design features and service characteristics of these vessels. Furthermore, these guidelines provide a standard of safety equivalent to the relevant requirements of the International Convention for the Safety of Life at Sea, 1974, as amended, and in particular to the stability criteria of the Code on Intact Stability for all Types of Ships Covered by IMO Instruments (IS Code) as amended. Provisions for offshore supply vessels carrying more than 12 industrial personnel are not included in these Guidelines. When an offshore supply vessel is used for special purposes, such as diving assistance or oceanographic surveys, the persons on board in connection with these special purposes should be treated as special personnel.