This part of ISO 19901 provides requirements and guidance for the planning and engineering of marine operations, encompassing the design and analysis of the components, systems, equipment and procedures required to perform marine operations, as well as the methods or procedures developed to carry them out safely.This part of ISO 19901 is applicable to marine operations for offshore structures including. steel and concrete gravity base structures (GBS);. piled steel structures and compliant towers;. tension leg platforms (TLP);. deep draught floaters (DDF), including spars or deep draught caisson vessels (DDCV);. floating production semi-submersibles (FPSS);