For a correct baltic sea chart ww2 you should use
Kriegsmarine map 3100 (south half)
IMO the given maps for the scapa operation are cheats. Give us historical correct infos BEFORE the scapa operation took place and not AFTER everything was analyzed and reviewed.
For example:
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http://img.xrmb2.net/images/317110.jpeg (scapa 1939)
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http://www.sharkhunters.com/scapa2.jpg (german aerial reconnaissance 1939)
etc.