Heavy Shot Strength Ultimate Plan in Assassin’s Creed IV Black Flag Resynced is needed to buy the final Heavy Shot Strength ship upgrade at the harbourmaster.
Heavy Shot Strength Ultimate Upgrade Plan Location
Heavy Shot Strength Ultimate Plan is a reward for solving Treasure Map from Ambergris Key (Misteriosa).
Treasure Map Location: Ambergris Key (28, 160) – swim into the cave through the underwater tunnel, then enter the big room with a locked chest and many enemies. Climb the pillars around the middle of the room to find it on the upper floor.
Treasure Map Solution: Misteriosa (271, 178) – Fast travel to the viewpoint but turn around instead of jumping down, you’ll see a water fountain behind the mayan temple (on the top level). The buried treasure is to the left of the fountain in the grass, behind tall white flowers.
For all other Plans refer to All Ultimate Upgrade Plan Locations and for everything else also check the Collectible Guide.
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