Assassin's Creed IV Black Flag - Great Inagua Treasure Map

In this episode of Assassin’s Creed IV: Black Flag, I need some help from Youtube. I try to get this treasure map in the Great Inagua. But I couldn't figure out how to get it. So, if you know how, please let me know. Thanks, #asassinscreed #assassinscreedblackflag Playlist:    • Assassin's Creed Black Flag