When the captain asks if anyone had ever been to the land ahead, who says he has? What is his description of the island?

At this point, Long John Silver admits that he has been on the island before, claiming that he was there as a cook on trading shop that was forced to stop on the island for water. While there, he claims that he learned the pirates' names for places on the island and offers to help the captain find the best place to anchor. He claims that the best place is an islet denoted as Skeleton Island, and that the previously identified highest hill is called Spy-glass, since it was the pirate's lookout