Assassin's Creed 4 Black Flag World Map | Attack of the Fanboy
Assassins Creed 4 Black Flag Treasure Map 633, 784 Nassau (Reward: Grey Sails) - YouTube
Assassin's Creed IV: Treasure Map 633-784 - Orcz.com, The Video Games Wiki
Assassin's Creed 4: Black Flag", All Treasure Maps and Treasure locations - YouTube
Assassin's Creed Black Flag - Treasure Map Nassau (633, 784) - Grey Sails Plan - YouTube
Bartender at Nassau told me there's a treasure map hidden somewhere around here. Didn't expect to meet someone else who was already literally "looking" for this map before me (AC Black Flag) :
Buried Chests - Assassin's Creed IV: Black Flag Wiki Guide - IGN
Assassin's Creed IV: Black Flag – Buried Treasure Guide | GameDynamo
Nassau Chests Locations Guide - GosuNoob.com Video Game News & Guides