I actually never got the boat docks working. I tried for days now. Today, I got this error message:

release-949 (x64)[M]
archipelago_biome/components/boat_dock/boat_dock.lua:30: attempt to call method 'stop' (a nil value)
stack traceback:
[C]: in function 'stop'
archipelago_biome/components/boat_dock/boat_dock.lua:30: in function <archipelago_biome/components/boat_dock/boat_dock.lua:26>
[C]: ?
[C]: in function 'update'
radiant/modules/events.lua:59: in function '_update'
radiant/server.lua:67: in function <radiant/server.lua:64>

Apart from that tiny thing, I really like this mod!