Just used Open Sea iPhone app for a week while boating on the Havel.
So much stuff which is not in there, even several locks, most yellow sea marks are missing, several shallow waters not marked...
I have no clue how to add that ... I did edit open street map back in the day.

ann_effes@berlin.social
@ann_effes@berlin.social
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My openseamap rendering, here with maptiler basic style as background.