Wandersail

Derethil and the Wandersail is a story that Hoid tells to Kaladin the night that Maps, a fellow bridgeman, dies. This is also the night that Kaladin find out about the effects Stormlight has on him, and Teft's suspicions are confirmed. The Wandersail is the boat that Derethil traveled on in the story, which was built to sail the seas during Highstorms, a thing no other boat had done. It was nearly destroyed, shipwrecked on an island in the middle of the ocean, by a giant whirlpool where it is said the sea drains and later it is mentioned that it was fixed in the Uvara shipyards. Eventually, Derethil and his remaining crew left on the Wandersail, using the momentum of the whirlpool to get them away from it.