FOCCUS’s aim is the co-production of ocean monitoring and forecasting information between Copernicus Marine operational global/regional systems and a pool of national coastal systems for different overarching uses (support to policies, blue economy and wider human activities). A seamless regional to coastal modelling co-designed framework will be built and implemented by developing interfaces and advancing the regional-coastal linked modelling systems, advancing observations needed for calibration / validation of systems, improving the land-to-ocean interface in regional and coastal systems, and through demonstration case studies that will integrate FOCCUS’ R&I developments. Advances will be transferable and upscalable to support improvement of coastal ocean monitoring and forecasting systems in the Global Coast. FOCCUS will apply open science by engaging end-users in the design of the applications and end-users, tailoring applications corresponding to societal needs.