All ultimate ship plans locations in Assassin's Creed Black Flag Resynced
Overview & Key Takeaways
Here's where to find every ultimate upgrade plan for the Jackdaw ship in Assassin's Creed Black Flag Resynced.
Ultimate ship plans allow you to upgrade the Jackdaw in Assassin's Creed Black Flag Resynced, and turn your ship into the most powerful, intimidating, and indestructible vessel to ever sail the Caribbean. There's just one problem: Most ship upgrade ultimate plans are either buried on remote islands or dropped at the bottom of the ocean.
As it would take many hours to dig them up by yourself, here's where to find every ultimate ship plan in Assassin's Creed Black Flag Resynced.
How to find ultimate ship plans in Assassin's Creed Black Flag Resynced
Once you've unlocked Edward's homestead at Great Inagua during the "This Old Cove" main quest, you can build and upgrade the harbormaster stand at the docks (see the location marked in the picture below). Once you've fully upgraded this shop and begun upgrading the Jackdaw, you'll find that most of the ship's features require an "ultimate plan" to unlock the final upgrade. You will find these ultimate plans by collecting buried treasures and looting shipwreck locations with the diving bell.
Graphic: Marloes Valentina Stella/Polygon | Source images: Ubisoft via Polygon
If an ultimate plan is found in a buried treasure chest, you must obtain the treasure map first, then find the buried treasure's location by studying the map. The list below includes links to more detailed treasure map and buried treasure locations. To find the ultimate plans hidden in shipwrecks (diving bell locations), complete the main quest called "Diving for Medicines," after which the shipwreck locations will become visible on the map. Sail the Jackdaw to such a location, dive down, and scan the area for a special chest — unlike "regular" treasure chests, a chest containing an ultimate plan is slightly larger and counts as a location "secret."
On top of the ultimate plans, it'll require a hefty amount of reales to install the ultimate ship upgrades. To help you spend your gold wisely, you may want to look at our list of the best ship upgrades before you purchase any.
All ultimate ship plan locations in Assassin's Creed Black Flag Resynced
Here's an overview of every ultimate upgrade plan in Assassin's Creed Black Flag Resynced and where to find it. In the case of treasure maps, numbers followed by "A" mark the map location, and that same number followed by "B" marks the corresponding buried treasure location.
Graphic: Marloes Valentina Stella/Polygon | Source images: Ubisoft via Polygon
| # | Ultimate plan | Upgrade cost | How to get |
|---|---|---|---|
| 1 | Broadside Cannons Number Ultimate Plan | At coordinates (440, 145) in Charlotte, dive to The Blue Hole shipwreck. The chest with the Broadside Cannons Ultimate Plan is in the northern corner. Watch out for the shark! | |
| 2 | Fire Barrel Storage Ultimate Plan | Collect the Petite Caverne treasure map at the heart of the smuggler's den, behind some crates at coordinates (862, 237). The ultimate plan is buried in the southern part of Tulum, next to the watchtower at coordinates (40, 372). | |
| 3 | Fire Barrel Strength Ultimate Plan | Get the Santanillas treasure map from the high cliff in the east, at coordinates (191, 218), and dig up the ultimate plan in the San Juan grotto, which you must enter through an underwater tunnel. The ultimate plan is buried in the first dry section, next to the old wooden cart at coordinates (455, 462). | |
| 4 | Harpoon Strength Ultimate Plan | Find the Mariguana Island treasure map at coordinates (847, 514), behind the flowery vines. Dig up the treasure chest on Andreas Island, at coordinates (544, 693), on the south beach. | |
| 5 | Heavy Shot Storage Ultimate Plan | Get the Cayman Sound treasure map from the island's northwest beach, at coordinates (298, 311). The ultimate plan is buried on Petite Caverne, in the deepest part of the cave, at coordinates (863, 235). | |
| 6 | Heavy Shot Strength Ultimate Plan | Pick up the Ambergris Key treasure map from the heart of the smuggler's den (the higher floor) at coordinates (28, 159). The ultimate plan is buried on Misteriosa, next to the fountain on top of the Maya temple, at coordinates (271, 178). | |
| 7 | Hull Armor Ultimate Plan | - 30,000 reales - 400 metal - 750 wood | Explore the San Ignacio shipwreck in Dry Tortuga, at coordinates (348, 745), which you'll come across during "Diving for Medicines." The chest with the Hull Armor Ultimate Plan is in the northwest, inside the large hull (beware of the shark). |
| 8 | Mortar Storage Ultimate Plan | Collect the Tortuga treasure map at the northeast beach, coordinates (851, 352). The buried treasure is on Matanzas, at coordinates (312, 617), next to the Mayan Stela puzzle in the southeast. | |
| 9 | Mortars Ultimate Plan | Go to the Antocha Wreck in Gibara, at coordinates (600, 636). The chest with the Mortars Ultimate Plan is in the southern corner (watch out for the shark). | |
| 10 | Ram Ultimate Plan | - 15,000 reales - 200 metal - 600 wood | Explore La Conception Wreck in Chinchorra, at coordinates (150, 271). The Ram Ultimate Plan is inside the first chest directly north of the diving bell. It's just a brief swim away. |
| 11 | Round Shot Strength Ultimate Plan | Dive to the Kabah Ruins shipwreck at coordinates (738, 120), Navassa region. The ultimate upgrade plan is at the end of the narrow tunnel to the north. There's a strong, intermittent current coming from that direction, so you'll have to take cover in the small nooks before moving to the next section of the tunnel. | |
| 12 | Swivel Guns Ultimate Plan | Go to the Devil's Eye Caverns shipwreck location at coordinates (456, 332) in Cruz. Follow the tunnel to the north; shortly after it loops back south, you will find yourself in a dry chamber inside the wreck (can't miss it). In the dark corner on the left, find the chest with the Swivel Guns Ultimate Plan. |
