Assassin’s Creed 4 Black Flag Resynced Round Shot Strength Ultimate Plan Location

Round Shot Strength Ultimate Plan in Assassin’s Creed IV Black Flag Resynced is needed to buy the final Round Shot Strength ship upgrade at the harbourmaster.

Round Shot Strength Ultimate Upgrade Plan Location

Round Shot Strength Ultimate Plan is looted from an underwater chest in Kabah Ruins Shipwreck (738, 120).

For all other Plans refer to All Ultimate Upgrade Plan Locations and for everything else also check the Collectible Guide.