Hello, I didn't found any threads about boats, then started one by myself.
The main idea, is about the little boats, for domestic purposes, like fishing.
The boat should be a area designated by a new item, the boatbench,
and that are should be not totally attached to the land, they should be linked by a harbour, a new building, designated like a bridge, so, when you finish building the boat, you should use to get more fishes(and add some fishs that just appear in the deep ocean), the steering for the boat should be simple, the one who is piloting the boat need paddles, if that one is strong, and the paddles are well-crafted , te boat will move faster, but if hte boat is too huge, will be slower and harder to control.
The boats should be used by merchants, to transport goods to outpost that's on far away on sea island(by the way, they can be used in place of wagon, when you go sttle on a island)
The ships are really bigger versions of boats, they can hold a really big crew, can hold cargo, and can have guns, for some tipes of sea battles.
The ship are designed by masts, and sails can be made of cloth and put in the mast, for propulsion.
Ships have a steering whell, for direction change.
As a minor thing, maps shuold be implemented, becasue the dwarves doesn't know where everyplace of the world is(just a really minor thing)
So when the army arc and county will completely implemented, we can build boats to transport beetwen maps and ships to trade beetween ports, and conquest seaside places.
So Storms can be added, damaging your sails, slowing your down and almost sinking your ship.