This part of ISO6185 specifies the minimum safety characteristics required for the design, materials, manufacture and testing of rigid inflatable boats (RIBs) with a hull length of between 8m and 24m and with a motor power rating of 15kW and greater. This part of ISO6185 is applicable to TypeIX and TypeX RIBs intended for use within the operating temperatures of−20°C to+60°C. TypeIX: Powered boats, fitted with a buoyancy tube covering at least 85%of the port and starboard sides, suitable for navigation in inshore and sheltered waters, up to and including wind force 6 Beaufort and significant wave heights up to 2m (design categories C and D), with a hull length of between 8m and 24m and with a motor power rating of 15kW and greater. TypeX: Powered boats, fitted with a buoyancy tube covering at least 85%of the port and starboard sides, suitable for navigation in waters, up to wind force 8 Beaufort and significant wave heights up to 4m (design categoryB), with a hull length of between 8m and 24m and with a motor power rating of 75kW and greater. NOTE1 General arrangements of typical boats of TypesIX and X are given in AnnexesA and B, respectively. NOTE2 For boats with power ratings of 4,5kW and less, refer to ISO6185‑1 . For boats with power ratings of 4,5kW to 15kW inclusive, refer to ISO6185‑2 . For boats with a hull length of less than 8m and power rating of 15kW and greater, refer to ISO6185‑3 . Boats outside these types or outside of TypeIX and TypeX, as defined, are outside of the scope of ISO6185 . NOTE3 For inflatable boats with a hull length greater than 8m, it is suggested to use the requirements of ISO6185‑3 .