The ship is your most important asset in the remastered Assassin’s Creed Black Flag. A stronger ship will give you a better chance of dealing with battles at sea, making the overall game more manageable.
However, as you continue to improve your ship, you will eventually be affected. Instead of simply asking for materials, the Harbormaster will ask for Ultimate Plans. These programs are hidden throughout the open world of the game.
If you’re looking to make Jackdaw as powerful as possible, this guide is for you. Here’s how to get all of the Ultimate Ship Plans in Assassin’s Creed Black Flag remastered.
Broadside Cannons Number Ultimate Plan
Broadside Cannons Number Ultimate Plan can be found in a secret chest deep in the Blue Hole Diving Bell. This particular Diving Bell is located in Charlotte County. Its coordinates are 438, 145.
A secret chest containing the Broadside Cannons Number Ultimate Plan is located on the north side of the Blue Hole map. See the image below for reference.
The Ultimate Fire Barrel Storage Plan
The Fire Barrel Storage Ultimate Plan can be found in the Tulum Excavation, located in Conttoyor. Before you can dig in the area, however, you must first find the Treasure Map in the Petite Caverne. Remember, you can track down the Treasure Map icon on the Petite Cavern map, making it easy to find.
After searching for the Treasure Map in Petite Caverne, you can officially pick up the Fire Barrel Storage Ultimate Plan from Tulum. The direct links of this program are 40,372.
Fire Barrel Strength Ultimate Plan
To get the Fire Barrel Ultimate Plan, you must first get its Treasure Map from Santanillas in Chinchorro. After searching for the Treasure Map, you can find the plan inside the San Juan Cave in Cruz County.
When you get to San Juan, you will have to go underwater to find your way into the cave. Once inside, the excavation site can be found near the water. Links are 455,462.
Harpoon Strength Ultimate Plan
The Harpoon Strength Ultimate Plan excavation site can be found on Andreas Island in the Eleuthera region. However, before this excavation site can be found, you must first find a map of its treasures, located on the island of Mariguana in Gibara. The treasure map can be easily found by tracing its icon from the Mariguana Island game map.
After collecting the Treasure Map on Mariguana Island, make your way to link 544,693. These are links to the dig site that contains the Harpoon Strength Ultimate Plan.
Heavy Shot Storage Ultimate Plan
The Heavy Shot Storage Ultimate Plan excavation site can be found inside the hidden Petite Caverne in the Punta Guarico district. However, you must first search for the Treasure Map of this excavation site, which is located in Cayman Sound in Castillo de Jagua.
The first image below shows where the Treasure Map is located, and the second shows the exact location of the excavation site for the Large Shot Storage System.
After collecting the Treasure Map from Cayman Sound, which is easily found by pressing the Treasure Map icon and following its waypoint, make your way to the Petite Cavern to get the last Heavy Shot Storage System. Its exact location can be found in the images below, at 863,235 coordinates.
Heavy Shot Strength Ultimate Plan
The Heavy Shot Strength Ultimate Plan mining site is located in Misteriosa in the Serranilla region. Before you can search for this plan, you must first find the Treasure Map in the hidden Ambergris Key cave in Chinchorro. This hidden cave is located at 28,159 links.
After collecting the Treasure Map and making your way to Mysteriosa, go to the 271,178 links. It is here that you will find the excavation site for the Heavy Shot Strength Ultimate Plan.
Hull Armor Ultimate Plan
The Hull Armor Ultimate Plan can be found in a secret chest while exploring the San Ignacio Wreck Diving Bell. This particular Diving Bell is located in the arid region of Tortuga at coordinates 348,744.
When exploring the San Ignacio Wreck Diving Bell, make your way to the northwest corner to find a secret chest inside the wreck. Inside the chest, you’ll find the Hull Armor Ultimate Plan. The picture below shows its exact location.
Mortars Ultimate Plan
The Mortars Ultimate Plan can be obtained by looting a secret chest in the Antocha Wreck Diving Bell. This Diving Bell can be found in the district of Gibara, located at coordinates 600,635.
When exploring the Antocha Wreck Diving Bell, head to the south side of the map to find a chest with Mortars Ultimate Plan inside.
Mortar Storage Ultimate Plan
Before players can claim the Mortar Storage Ultimate Plan, they must first find its Treasure Map. The Treasure Map is located in Tortuga in the Punta Guarico region. Once you find that, you can search for a program at the Matanzas mining site in Dry Tortuga.
The images below show the exact location of the Sludge Storage Facility. In this area, you will find a waterfall, and the digging area can be found behind the falling water.
Swivel Guns Ultimate Plan
The Swivel Guns Ultimate Plan can be found inside a secret chest in the Devil’s Eye Cavern Diving Bell located in the Cruz region. The coordinates of this Diving Bell are 453, 323.
A secret chest with Swivel Guns Ultimate Plan is found in a small alcove with zero water. You can find the exact location of this program in the image shown below.
Ram Strength Ultimate Plan
The Ram Strength Ultimate plan can be found inside a secret chest inside the La Concepción Wreck Diving Bell. This Diving Bell is located at 150,271 coordinates in the Chinchorro region.
A secret chest containing the Ram Strength Ultimate Plan can be found inside a shipwreck on the north side of the La Concepcion Wreck map.
Round Shot Strength Ultimate Plan
The Round Shot Strength Ultimate Plan can be found inside the Kabah Ruins Diving Bell located in the Navassa region. There are 741,118 direct links to this Iron Man.
When exploring the Kabah Ruins, a secret chest can be found on the north side of the map. This chest contains the Round Shot Strength Ultimate plan for Jackdaw.
Now that you have collected all the Jackdaw Elite Ship Upgrades in Assassin’s Creed Black Flag Resynced, you can upgrade it to its highest level if you have the right items.
- Released
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July 9, 2026
- The ESRB
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Mature 17+ / Blood, Sexual Themes, Strong Language, Use of Alcohol, Violence / In-Game Purchases, User Interaction
