All Final Ship Upgrade Locations in AC Black Flag Resynced (Ultimate Plans)

Since a large portion of Assassin’s Creed Black Flag Resynced is spent sailing across the Caribbean, battling powerful ships, and capturing forts, keeping the Jackdaw fully upgraded should always be a priority. While most upgrades can be purchased at any Harbourmaster early on, there are 12 final upgrades that remain locked until you find their respective Ultimate Plans.