If you want the most powerful ship in Assassin’s Creed Black Flag Resynced, completing all Harbormaster upgrades won’t be enough. Rather, you have to earn this power by finding all the Ultimate Plans for Jackdaw – what were Elite plans in the original. There are a total of twelve of them, and we’ve provided coordinates below for each, as well as directions for where to find them.
Every Ultimate Ship Plan Location in Black Flag Resynced
Before hunting for all the plans, you have to note that most of them can be found after unlocking the Diving Bell in Sequence 6. But if you’re an avid treasure hunter like me, you can proceed with the treasure hunt. I’ve marked the upgrades that can be unlocked without the Diving Bell with a star(*) in the table below. Happy hunting!
| Ship Upgrades | Where To Find | How to Acquire |
|---|---|---|
| Round Shot Ultimate Plan | Kabah Ruins Shipwreck (738,120) | Swim to the topmost section, then swim east to find the Underwater Chest for this upgrade plan. |
| Heavy Shot Ultimate Plan* | Misteriosa (271,178) | Collect the map at (28,160), and then sail to the given coordinates. On the left side of the fountain, you’ll find the chest. |
| Fire Barrel Ultimate Plan* | Cruz (455,462) | Find the map at (191,218), then travel to (455, 462) for the chest. You’ll find the treasure on the right-hand side of the cart. |
| Mortar Ultimate Plan | Antocha Wreck (601,633) | Open the Underwater chest present in the southernmost part of the Antocha Wreck. |
| Swivel Gun Ultimate Plan | Devil’s Eye Cavern Shipwreck (456, 332) | In the eastern part of the Shipwreck, you’ll find a large Underwater Chest; open it to acquire this upgrade plan. |
| Broadside Cannon Ultimate Plan | The Blue Hole Shipwreck (440,145) | Swim to the northernmost part of the area to find the Underwater Chest containing the upgrade plan. |
| Ram Ultimate Plan | La Concepción Shipwreck (184,425) | In the northern-middle part of the wreck, you’ll come across two chests. Open the bigger chest to unlock the ship upgrade. |
| Hull Armor Ultimate Plan | San Ignacio Shipwreck (348,774) | In the northernmost section of the Shipwreck, you’ll come across an Underwater Chest; collect the plan by opening it. |
| Heavy Shot Storage Ultimate Plan* | Southern Punta Guarico (863,235) | Collect the Treasure Map from the skeleton at (298,331), and then sail to the provided coordinates. You’ll find the chest in the cove with a waterfall. |
| Fire Barrel Storage Ultimate Plan* | Southern Conttoyor (40,372) | Find the Treasure Map at (862,237), and then travel to the given coordinates to find the upgrade plan. You’ll find the plan by interacting with the sandy patch near the broken ship. |
| Mortar Storage Ultimate Plan* | Western Gibara (534,510) | Get the Treasure Map at (851,352), and sail to the given coordinates. You’ll find the treasure behind the waterfall in the given area. |
| Harpoon Ultimate Plan* | Eleuthera (544,693) | Collect the map at (847,514), and then go to the provided coordinates. You’ll find the treasure beneath V-shaped coconut trees. |
