Using a seaworthy doesn't display sound and animation correctly. The character just stands there and does nothing, but the process of transporting between DLCs is okay.
Using a boomerang on a ship is a bad choice, because It's impossible to catch that flying-back weapon.
Besides, coral stones can't be hammered. The character just rows the ship endlessly. This happened when the tar edition was released, now it is here again.
use a seaworthy use a boomerang on a ship hammer a coral stone