Human activities exert great pressures on the health of our marine environment, its biodiversity and the functioning of its ecosystem. The EU-funded project GES4SEAS will inform and guide marine governance with a view to minimising these pressures and their impacts to ensure continued provision of ecosystem services. It will develop, test, demonstrate and upscale an innovative and flexible toolbox relevant to adaptive ecosystem-based management. This will support Good Environmental Status in the context of the Marine Strategy Framework Directive and support policies at national, European and international levels. GES4SEAS solutions will be tested and demonstrated at 11 learning sites, including one in the Caribbean Sea.