Interoperable, standardised and adequate tools are important for coastal zone management and maritime safety. In respect to geographic data, it is a fundamental problem that data on the landward side is collected and main-tained by topographic mapping or cadastral agencies utilised primarily for development, nature conservation etc., while sea data is collected by hydrographical survey services, focusing primarily on marine navigation issues. Furthermore, the collaboration between member states at national, regional and local level can be improved. The BLAST project has a primary focus on “Bringing land and sea together”, by harmonizing and integrating data for land and sea. BLAST will in part improve the functionalities of databases, and it will provide input to improve SafeSeaNet. The overall aim of the project is to improve Integrated Coastal Zone Management and Planning (ICZM&P) and maritime safety in a broad sense, by improving and contributing to harmonising terrestrial and sea geographical data and by developing planning and visualisation tools as well as improvement of navigation, in the context of climate change.