Assassins Creed Black Flag Resynced Ultimate Plan Locations

Ultimate plan locations are twelve specific Caribbean coordinates split between six underwater shipwrecks and six buried treasure chests across the sea. You salvage wreck chests through the diving bell and unearth buried chests after securing coordinates from skeletal maps.

Where Are Shipwreck Ultimate Plans Found?

Shipwreck plans are six underwater blueprints retrieved directly from sunken vessel chests without needing a prior map. Accessing these wreck sites requires the diving bell, unlocked during the Sequence 6 story mission Diving for Medicines. Each underwater chest containing an Ultimate Plan is visibly larger than standard gold containers and registers as a secret on the sector map. Detailed sector positions documented in Eurogamer's upgrade guide pinpoint the following six wreck locations:

1. Hull Armor Ultimate Plan: San Ignacio Wreck at coordinates (348, 745) in the Dry Tortuga region. Swim northwest inside the large hull segment while evading nearby great white sharks.
2. Round Shot Strength Ultimate Plan: Kabah Ruins at coordinates (738, 120) in the Navassa region. Swim past the temple ruins into the western tunnel, timing forward movement between periodic water current surges by tucking into side crevices.
3. Mortars Ultimate Plan: Antocha Wreck at coordinates (600, 636) in the Gibara region. Descend from the bell and head directly south toward the broken hull section where the chest sits near ocean predators.
4. Swivel Guns Ultimate Plan: Devil's Eye Caverns at coordinates (456, 332) in the Cruz region. Follow the northern winding tunnel past floating jellyfish into the interior dry chamber, then loot the chest located on the left rock ledge.
5. Ram Ultimate Plan: La Concepción Wreck at coordinates (150, 271) in the Chinchorro region. Swim directly north through the jellyfish clusters near the bell to find the chest sitting inside the immediate hull structure.
6. Broadside Cannons Number Ultimate Plan: The Blue Hole at coordinates (440, 145) in Charlotte. Head toward the far northeastern floor of the trench below a derelict vessel hull to open the storage box.

The iconic solo pirate adventure returns. Sail the Caribbean as Edward Kenway during the Golden Age of Piracy in this faithfully enhanced remake featuring stunning visuals, upgraded gameplay, and new content. — the official Steam store page

Where Are Buried Treasure Ultimate Plans Located?

Buried treasure plans are six overland schematics locked behind two-step scavenges that require picking up a parchment before digging. Unmarked dig mounds do not display an interaction prompt until you loot the corresponding skeleton corpse holding the coordinates. According to Polygon's Jackdaw walkthrough, the six combat blueprint map pairings consist of the following paths:

1. Harpoon Strength Ultimate Plan: Collect the parchment at Mariguana Island coordinates (848, 514) inside a rock cave obscured by hanging vines. Travel to Andreas Island coordinates (544, 693) and dig on the small sand spit south of the shoreline between two palm trees.
2. Mortar Storage Ultimate Plan: Collect the parchment on the northeastern beach of Tortuga at coordinates (851, 352) near a fallen skeleton and rowboat. Sail to Matanzas at coordinates (312, 617) and dig directly behind the water pool behind the waterfall.
3. Fire Barrel Storage Ultimate Plan: Collect the parchment inside the smuggler hideout at Petite Caverne coordinates (862, 237) behind supply crates. Sail to Tulum at coordinates (40, 372) and dig along the southern beach near the wooden watchtower.
4. Heavy Shot Storage Ultimate Plan: Collect the parchment at Cayman Sound coordinates (297, 311) among coastal rocks on the northwest shoreline. Return to Petite Caverne coordinates (863, 235) and dig near the stalagmites behind the inner waterfall.
5. Fire Barrel Strength Ultimate Plan: Collect the parchment at Santanillas coordinates (191, 218) atop an elevated rock reached by climbing tree trunks. Sail to San Juan at coordinates (455, 462), swim through the submerged tunnel opening, and dig beside the wooden cart in the first dry chamber.
6. Heavy Shot Strength Ultimate Plan: Collect the parchment at Ambergris Key coordinates (28, 160) by swimming through the underwater jellyfish cave and climbing into the upper ruin chamber. Travel to Misteriosa coordinates (271, 178) and dig on the grassy platform behind the stone serpent fountain.

Collecting these documents completes map entries tracked inside treasure maps records, granting 3,000 bonus reales beside each schematic.

Which Jackdaw Upgrades Require Ultimate Plans?

Jackdaw upgrades are tier-five enhancements purchased at a harbormaster once specific blueprints enter your inventory. As documented on the official Steam store page, naval encounters require heavy ship reinforcements to defeat fortified bastions and high-level vessels. Preparing Edward Kenway's flagship to combat legendary ships or finish challenging naval contracts requires investing gold and raw cargo alongside each recovered plan.

Crafting all twelve components completes the full naval weapon tree covered in jackdaw upgrades, turning the ship's cannons gold and awarding the Ship This achievement.