Okay step by step explanation: The hero step on the world map, and suddenly he comes to the water, there is a boat or ship.
He steps in, and the moment, the boat or vessel movement, of course, the hero is not safe, because even on a boat or ship that sails may still be attacked, so how are you all in a whole?, He must ship or boat also leave.

Make it so that the ship's graphic disappears and the player's graphic turns into the ship These can be found under the Move Event command.