This book (in English) contains information about near 1800 marinas, naturharbors and anchorages, located on the Baltic seafront. Swedish and Danish harbours at Straits are included. Edition 5 (2020) contains 501 A5 раges .
You can see or download first 50 р., download full POI file for GPS (GPX format, ZIP).
Details and links: http://parusanarod.ru/bib/books/harbors/index.htm