Episode six takes us back to the marine world, where we learn how satellite data is used to monitor the marine environment, support maritime safety and help manage fishing activity off the coast of West Africa. Satellites such as Copernicus Sentinel-3 can observe large parts of the ocean from space, providing useful information for management of ocean resources and maritime safety.Host, Mark Higgins, introduces the subject with guests, Hayley Evers-King (EUMETSAT) and Kwame Adu Agyekum (University of Ghana).