Treasure Charts are a special type of Sea Chart found by Link in The Legend of Zelda: The Wind Waker as he sails around The Great Sea. These charts are usually found as random treasure or rewards in dungeons or from other quests and mini-dungeons. Locations of sunken treasure chests are marked on the charts and, using the Grappling Hook, Link can fish for them from the King of Red Lions. There are hundreds of Treasure Charts in the game and most contain either a large amount of Rupees (20-500) or a Piece of Heart. Special charts called Triforce Charts also exist and while their function is the same, thier purpose is much greater.
They are found all over the Great Sea in dungeons, on islands, and anywhere there is a minor puzzle to be solved or a medium treasure to be obtained.
The chests found by Treasure Charts usually contain Rupees or Pieces of Heart.