Search the following locations to find the plans for the corresponding ship upgrade. 

Ship                        Location
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Elite Round Shot          - Kabah Ruins (coordinates 769, 145)
Elite Hull                - San Ignacio (coordinates 379, 770)
Elite Swivel Guns         - Devil's Eye Cave (coordinates 488, 353)
Elite Harpoon             - Andreas Island (coordinates 579, 720)
Elite Broadside Cannons   - The Blue Hole (coordinates 471, 170)
Elite Heavy Shot          - Petite Cavern (coordinates 901, 263)
Elite Fire Barrels        - San Juan (coordinates 479, 487)
Elite Fire Barrel Storage - Isla Providencia (coordinates 502, 44)
Elite Ram                 - La Concepcion Shipwreck (coordinates 181, 296)