The project EASYCO aims to build a Polycentric Infrastructure for Operational Ocean Modelling in the whole Atlantic Space joining complementary capacities from all the 5 countries (PortugalSpainFranceUKIrelandFranceIrelandUK. and , ). This infrastructure will forecast hydrodynamics and biogeochemistry at the regional scale using grids of the order of a few km’s. EASYCO builds on the successful experience gathered within the project EASY (www.project-easy.info) focused on currents and waves in the Iberian zone, widening its scope through the contribution of extra teams from France, Ireland and UK.