Young Lindy's Big Whoop Map Piece was one of the four seperated by Horatio Marley and his crew.
Guybrush Threepwood not being able to afford the price that the Antiques Dealer was asking for the map piece asked him if there was anything that he would be willing to trade for it. The Dealer told him that he had been looking for a famous figurehead and would happily swap the map piece for it.
Threepwood and Capsize travelled to the spot where the ship was supposedly sunk and he dived into the sea to find it. When he was successful, he pulled the head from the ship and took it back to trade with the Antiques Dealer.