To reveal the location of all collectibles (Animus Fragments, Chests, Secrets,
and Song Sheets) in the game, synchronize all the viewpoints.
Note: To get the West Indies Sea collectibles, you must conquer all Naval Forts.


All elite ship upgrade plan locations:
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Search the indicated locations at the listed coordinates on the world map to 
find all nine hidden elite ship upgrade plans in special chests and get the 
"Destroyer" trophy:

1. Elite Round Shot: Kabah Ruins - 769, 145 coordinates
2. Elite Hull: San Ignacio - 379, 770 coordinates
3. Elite Swivel Guns: Devil's Eye Cave - 488, 353 coordinates
4. Elite Harpoon: Andreas Island - 579, 720 coordinates
5. Elite Broadside Cannons: The Blue Hole - 471, 170 coordinates
6. Elite Heavy Shot: Petite Cavern - 901, 263 coordinates
7. Elite Fire Barrels: San Juan - 479, 487 coordinates
8. Elite Fire Barrel Storage: Isla Providencia - 502, 44 coordinates
9. Elite Ram: La Concepcion Shipwreck - 181, 296 coordinates