Looking for all Black Flag Resynced Ultimate Ship Plan Locations? There are 12 Ultimate Ship Plans in Assassin’s Creed Black Flag Resynced, and you’ll need every one of them to unlock the Jackdaw’s final ship upgrades. Six are hidden in underwater shipwrecks, while the other six are obtained from treasure maps. This guide shows the location of every Ultimate Ship Plan so you can fully upgrade the Jackdaw and prepare for the game’s toughest naval battles.
What Are Ultimate Ship Plans in Assassin’s Creed Black Flag Resynced?
Ultimate Ship Plans is the remake’s new name for what the original 2013 game called Elite Ship Upgrades. The name changed, but the job is the same: each plan unlocks the strongest possible version of one ship stat, like Broadside Cannons, Hull Armor, or Fire Barrel Storage.
You can’t just buy these upgrades with Reales and materials like the earlier tiers. You have to track down the plan first physically, then bring it to the Harbourmaster to unlock the purchase.
The 12 plans are split into two types:
- 6 plans from underwater shipwrecks – found by diving into wrecks scattered around the map
- 6 plans from treasure maps – found by digging up buried chests after solving a map
You’ll also need the Harbourmaster shop at Great Inagua fully upgraded (two upgrades beyond the base level) before it’ll sell you the final tier for any ship stat, even once you’re holding the plan.
All Ultimate Ship Plan Locations: Quick Overview
Here’s every plan, where it comes from, and roughly where to find it. Coordinates match the in-game map grid, so use them as a general reference point alongside the map itself.
| Ultimate Ship Plan | Source | Region | Coordinates |
| Hull Armor | Shipwreck (story mission) | Dry Tortuga | (found during “Diving for Medicine”) |
| Mortars | Shipwreck | Gibara | 600, 635 |
| Ram | Shipwreck | Chinchorro | 150, 271 |
| Swivel Guns | Shipwreck | Cruz | 455, 331 |
| Broadside Cannons Number | Shipwreck | Charlotte | 440, 145 |
| Round Shot Strength | Shipwreck | Navassa | 738, 120 |
| Heavy Shot Strength | Treasure map | Chinchorro then Serranilla | 28, 160 then 271, 178 |
| Fire Barrel Strength | Treasure map | Chinchorro then Cruz | 191, 218, then 455, 462 |
| Heavy Shot Storage | Treasure map | Castillo de Jagua then Punta Guarico | 298, 311 then 863, 235 |
| Fire Barrel Storage | Treasure map | Punta Guarico then Tulum | 862, 237 then 40, 372 |
| Mortar Storage | Treasure map | Tortuga then Matanzas | 851, 352 then 312, 617 |
| Harpoon Strength | Treasure map | Gibara then Andreas Island | 847, 514 then 544, 693 |
How to Unlock the Diving Bell and Start Collecting?
Before you can grab a single shipwreck plan, you need the Diving Bell. You’ll get it automatically while playing through the Sequence 6 main mission, “Diving for Medicine.” Until you’ve finished that mission, most of these locations are simply off-limits, so don’t worry if a dive site looks empty or locked right now.
Treasure maps don’t need the Diving Bell for most of them, so you can start hunting those down earlier if you want to get a head start.
One more thing worth knowing: nothing here is missable. Every plan can still be picked up in free roam after you finish the story, so there’s no need to rush.
Ultimate Ship Plans From Underwater Shipwrecks
These six plans all require the Diving Bell, which you’ll unlock during the “Diving for Medicine” mission in Sequence 6.
1. Hull Armor Ultimate Plan
- Unlocked after: This one’s a little different from the rest; you actually find it during the “Diving for Medicine” story mission itself, so you don’t need to come back for it later.
- Location: San Ignacio Wreck, Dry Tortuga region.
- Solution: Partway through the dive, a current pulls you through a cave section past a group of sharks. Once you see the diving bell ahead, don’t swim straight to it; turn left instead. You’ll find a wrecked ship with a hole in its side. The chest is inside.
- Reward: Hull Armor Ultimate Plan.
2. Mortar’s Ultimate Plan
- Unlocked after: Complete “Diving for Medicine” (Sequence 6) to unlock the Diving Bell, then sail to Gibara.
- Location: Antocha Wreck, Gibara region (600, 635).
- Solution: Use the Diving Bell to drop down, then swim toward the southernmost point of the wreck site. Look for a broken section of hull with an air barrel floating just outside. The chest sits along the left wall inside it.
- Reward: Mortar’s Ultimate Plan.
3. Ram Ultimate Plan
- Unlocked after: Complete “Diving for Medicine” (Sequence 6). Chinchorro is guarded by a strong fort and several high-level ships, so if your Jackdaw isn’t upgraded yet, approach from the southeast to avoid the worst of it.
- Location: La Concepción Wreck, Chinchorro region (150, 271).
- Solution: Dive down and head to the broken section of the ship just north of where you enter, close to the diving bell itself. A shark patrols this wreck, so wait until it turns away before swimming up to the chest on the second floor.
- Reward: Ram Ultimate Plan.
4. Swivel Guns Ultimate Plan
- Unlocked after: Complete “Diving for Medicine” (Sequence 6).
- Location: Devil’s Eye Cavern, Cruz region (455, 331).
- Solution: Swim north through the tunnels until they open up into a large, air-filled cave you can walk around freely. Take the tunnel on the left side of that cave; the chest is waiting at the end of it.
- Reward: Swivel Guns Ultimate Plan.
5. Broadside Cannons Number Ultimate Plan
- Unlocked after: Complete “Diving for Medicine” (Sequence 6).
- Location: The Blue Hole, Charlotte region (440, 145).
- Solution: Head to the far north end of the dive site. At ground level, you’ll spot a partly broken wreck; the chest is sitting inside it.
- Reward: Broadside Cannons Number Ultimate Plan.
6. Round Shot Strength Ultimate Plan
- Unlocked after: Complete “Diving for Medicine” (Sequence 6).
- Location: Kabah Ruins, Navassa region (738, 120).
- Solution: Swim into the cave at the north point of the dive map and follow the connecting tunnels. A strong current blocks part of the route; shelter in the alcove off to the right and wait for it to pass before continuing. If you’re running low on oxygen, look for air pockets in the ceiling.
- Reward: Round Shot Strength Ultimate Plan.
Ultimate Ship Plans From Treasure Maps
These six don’t need the Diving Bell for most of the walk (a couple of the chests are underwater, but you can reach them by free diving). You just need to find the map, then dig up the matching chest.
7. Heavy Shot Strength Ultimate Plan
- Unlocked after: No story requirement, sail to Ambergris Key and pick up the map.
- Location: Map at Ambergris Key, Chinchorro (28, 160). Buried chest at Misteriosa (271, 178).
- Solution: For the map, dive through the underwater tunnel entrance into a large room guarded by several enemies, then climb the pillars in the middle of the room to reach it on the upper level. For the chest, fast travel to the Misteriosa viewpoint, but instead of jumping down, turn around; you’ll see a fountain behind the Mayan temple. The treasure is to its left, hidden in the grass behind tall white flowers.
- Reward: Heavy Shot Strength Ultimate Plan, plus 3,000 Reales.
8. Fire Barrel Strength Ultimate Plan
- Unlocked after: No story requirement.
- Location: Map at Santanillas, Chinchorro (191, 218). Chest at San Juan, Cruz (455, 462).
- Solution: The map sits on a small hill; climb up using the tree branches wrapped around it. For the chest, swim through the underwater tunnel into the San Juan cave. As soon as you surface, you’ll find one enemy nearby. The treasure is just to the right, before the wooden scaffold.
- Reward: Fire Barrel Strength Ultimate Plan, plus 3,000 Reales.
9. Heavy Shot Storage Ultimate Plan
- Unlocked after: No story requirement.
- Location: Map at Cayman Sound (298, 311). Chest at Petite Caverne (863, 235).
- Solution: The map is sitting with a skeleton on the beach at Cayman Sound. At Petite Caverne, head for the Hutia hunting spot near the cave’s southern edge, then check behind the rocks by the waterfall.
- Reward: Heavy Shot Storage Ultimate Plan, plus 3,000 Reales.
10. Fire Barrel Storage Ultimate Plan
- Unlocked after: No story requirement.
- Location: Map inside Petite Caverne (862, 237). Chest at Tulum (40, 372).
- Solution: The map is with a skeleton inside Petite Caverne itself. Then sail down to the southern tip of Tulum, the chest is on the beach, tucked behind a shipwreck.
- Reward: Fire Barrel Storage Ultimate Plan, plus 3,000 Reales.
11. Mortar Storage Ultimate Plan
- Unlocked after: No story requirement.
- Location: Map at Tortuga (851, 352). Chest at Matanzas (312, 617).
- Solution: Grab the map from a skeleton on Tortuga’s eastern shoreline. The chest is in the south-east corner of Matanzas, tucked to the left of a Mayan Stelae, behind a waterfall.
- Reward: Mortar Storage Ultimate Plan, plus 3,000 Reales.
12. Harpoon Strength Ultimate Plan
- Unlocked after: No story requirement.
- Location: Map at Mariguana Island, Gibara (847, 514). Chest at Andreas Island (544, 693).
- Solution: Approach the map marker on Mariguana Island from the north to find a small cave entrance hidden behind leaves, crouch through the tunnel a few meters away to reach it. The buried chest itself is on a small island just south of Andreas Island.
- Reward: Harpoon Strength Ultimate Plan, plus 3,000 Reales.
Total Cost to Fully Upgrade the Jackdaw
Finding all 12 plans is only half the job; you still have to pay for the upgrades. Between the ship itself and maxing out the Harbourmaster shop at Great Inagua, expect to spend roughly:
- 309,800 Reales
- 4,755 Metal
- 2,750 Wood
- 550 Cloth
That’s a steep total, so it’s worth setting up Kenway’s Fleet early (it unlocks in Sequence 4). Send five Schooners out on missions for passive Reales, and five Brigs for passive materials, and the grind gets a lot less painful by the time you’ve tracked down every plan.
Summary
All 12 Ultimate Ship Plans in Black Flag Resynced boil down to two simple hunts: six dives once you’ve unlocked the Diving Bell in Sequence 6, and six treasure maps you can start chasing right away. Work through the list above region by region, keep Kenway’s Fleet running in the background to cover the cost, and you’ll have the Jackdaw fully upgraded and ready for the legendary ships in no time.
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FAQs Related to Ultimate Ship Plans in Assassin’s Creed Black Flag Resynced
Q: How many Ultimate Ship Plans are there in Black Flag Resynced?
A: There are 12 Ultimate Ship Plans, 6 in underwater shipwrecks and 6 from treasure maps.
Q: Where can I find Ultimate Ship Plans?
A: Six are found in underwater shipwrecks, and six are earned by completing treasure maps.
Q: Are Ultimate Ship Plans missable?
A: No. You can collect all 12 in free roam, even after completing the main story.
Q: When do underwater shipwrecks unlock?
A: After completing Sequence 6: Diving for Medicine.
Q: Do I need all 12 Ultimate Ship Plans?
A: Yes, if you want to unlock every final upgrade for the Jackdaw.
Q: Can I fully upgrade the Jackdaw without Ultimate Ship Plans?
A: No. The final tier of ship upgrades requires the corresponding Ultimate Ship Plan.
Q: What’s the difference between Ultimate Ship Plans and Elite Ship Upgrades?
A: None. They’re the same upgrades, just renamed in Black Flag Resynced.
Q: Do I need all 12 plans to beat the legendary ships?
A: No, but having them makes those battles much easier.
Q: Why can’t I buy an upgrade after finding its Ultimate Ship Plan?
A: Upgrade the Harbourmaster at Great Inagua and make sure you have the required materials and Reales.
Q: Can I revisit shipwrecks and treasure locations?
A: Yes. You can return anytime to collect any plans you missed.
