HiSea aims to develop, test, and demonstrate information services that provide high-resolution data on water quality at sea. The services offered by HiSea will integrate and process data obtained from marine, land, and climate services as well as local monitoring data and advanced modeling. The platform will improve the operation, planning, and management of various marine activities, with a focus on port and aquaculture uses. HiSea will provide high-resolution, state-of-the-art seawater quality data to answer specific questions from the port and aquaculture industry.