The document summarizes the process of creating a pilot maritime spatial plan for the Bothnian Sea between Sweden and Finland. It involved collecting spatial data on various human uses and natural features of the Baltic Sea from the HELCOM map service to understand that the Baltic Sea is a busy area with oil rigs, wind farms, shipping lanes, fishing grounds, and protected areas. The project tested a transboundary, offshore maritime spatial planning process and found it important to make all data and plans openly available online. It concluded that planning is an ongoing and iterative process.