Gawain never rides on a ship on the ocean that takes him towards the grail. However, on his adventure, Gawain comes to a castle full of maidens. To get to the castle, he needs the help of a boatman:
While Gawain was still thinking about the maiden, he saw a punt heading towards him from the direction of the castle, piloted by a boatman; when he reached the shore, the boatman said: "Sir, I bring you greetings from those damsels, and they also urge you not to keep what belongs to me; return ti to me, if you please."Gawain learns that the horse that he is on, which he won from another knight, is the the boatman's entitlement. Gawain, in need of a horse himself, strikes an agreement with the boatman, who promises to keep the horse in trust, for Gawain while Gawain is in the castle. He then brings Gawain across.