Ships are unlocked a bit down the line. You can build a Karve and a Longship once you get some bronze and iron. That will make sailing a lot easier. Those lines are wind yeah. You have to take the wind into account when sailing. If you have headwind you hoist the sails and use only the oars. During tailwind it's full sails for the big speed.
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I guess that's why the wind is being shown like this to make it more visible.
Thanks for the explanation.