Map found on the corpse of Captain Petra inside Shipwreck Cove. A free-roam miniboss encounter.
Shipwreck Cove coordinates H12-S8. Captain Petra's body is on the quarterdeck of the largest galleon wreck. Bring a Sharpened Saber to cut the map free from his belt.
Three sunken galleons in a triangle, crows circling
Miniboss Captain Petra (Level 18) plus 4 Skeleton Crew. Bring a full Brig crew.
Map 5 (final) + Captain Petra's Hat (cosmetic) + 5,000 Piastre
Map 5 leads to the final chest in Mermaid Lagoon. Coordinates I6-N1.