Second generation intact stability criteria: Application of operational limitations and guidance to a megayacht unit

Second Generation Intact Stability criteria (SGISc) are under finalization at IMO aiming to provide a set of not mandatory criteria covering phenomena related to intact stability in waves. SGISc introduce also operational guidance and/or operational limitations to the navigation. The former entails the analysis of operational data (e.g. speed and headings) as complementary aspects to the ship design strategies. Operational limitations consist of restrictions to the environmental conditions or geographical area where the vessel may sail. This paper focuses on the operational guidance and limitations as proposed at the 7th session of IMO Ship Design and Construction sub-committee. An overview of the current rules concerning the operational aspects of the criteria is given. A comprehensive assessment of a mega yacht unit is carried out for the excessive accelerations phenomena, except for the direct stability assessment. Results are going to be presented with special attention to the operational aspects.