Use the Custom Marker in the map to mark Vargas’ vessel ... This concludes our guide for the four Templar Hunts in Assassin’s Creed 4 Black Flag.

There are five Templar Keys to find in Assassin's Creed 4: Black Flag, and each is unlocked via a series of Templar Hunt side missions ... Head to the marker on the map, and follow Upton around.