Continuation and further development of the NAVISON activities, with the objective of ensuring continuity in the production of Underwater Radiated Noise (URN) maps and related analytical outputs in support of the implementation of the Marine Strategy Framework Directive (MSFD). This new phase of work under the NAVISON framework will focus on the refinement of the existing modelling methodology through the integration of newly available data, as well as on the establishment of a sustained and operational process for the regular production, update, dissemination and maintenance of URN maps for European seas.