The R&D activities of the CERSAT address scientifc problematics such as calibration/validation of satellite sensors, improving the knowledge of the ocean/atmosphere interface in terms of number and accuracy of the remote-sensed variables, understanding or quantifying the impact of satellite data with respect to other sources of data, bringing to users a more comprehensive and accessible view of the state of the ocean through adapted products and tools. This approach is in particular focused on various parameters such as sea surface temperature and salinity, ocean winds, ocean colour and waves.