No, because it can be close to several unconnected oceans, just like a shipyard. You could keep a list of all ferry-reachable fields within the workarea of a ferry yard (*), and then check for a given waterway whether a CheckStepFerry-approved path exists from any node on the waterway to any of these fields. (* this is actually an incorrect approximation in some corner cases but that shouldn´t matter normally) -- https://code.launchpad.net/~widelands-dev/widelands/ferry/+merge/351880 Your team Widelands Developers is subscribed to branch lp:~widelands-dev/widelands/ferry.
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