Visiting small boat ports of the Baltic Sea fascinates both national and international visitors, many of who explore the area using small leisure boats. As members of HELCOM, the countries around the Baltic Sea aim to reduce the release of latrine sewage from boats into the sea. Moreover, the possibility of emptying latrine sewage from leisure boats can be considered a fundamental service for boaters, which, when neglected, has a crucial impact on boaters’ comfort. However, this basic service suffers from problems, including: 1) lack of easily accessible and functional sewage pump-out stations; 2) non-harmonized sewage collecting equipment; and 3) lack of easily accessible information regarding location and functionality of pump-out stations. To improve the experience for tourists, BATSECO-BOAT aims to improve capacity and service level of latrine sewage collection in small boat ports in Estonia, Finland and Sweden to facilitate mobility of small boaters. A strategy will be developed containing cross-regional guidelines to inform decision-making with regards to investment into sewage collection infrastructure. This strategy will be based on information on i) institutional landscape and legislation, ii) traffic flow of leisure boats, iii) costs, iv) best available technology for waste handling, v) analysis of latrine sewage, and vi) estimation of sewage flows. Digital tools and guidelines will be developed, informing local investment and the four investment packages, leading to improved services in 18 ports in the Central Baltic. An important output from the project will be the compilation document, providing guidelines and lessons learnt, which can be used to replicate investments in other regions beyond the project completion. The project will also conduct a scoping study for creating a digital map, showing the network of functional sewage collection services to enable cross-border mobility across the Central Baltic region.