All Ultimate Ship Upgrade Spots in AC Black Flag Resynced

Assassin’s Creed Black Flag Resynced introduces a suite of Ultimate Ship Upgrades for the Jackdaw. To unlock each enhancement, players must locate the corresponding blueprints, with several upgrades demanding an accompanying treasure map.

While many of these blueprints appear in the same spots as in the original title, a handful have been repositioned, and one has been relocated entirely. Consequently, legacy guides may fall short. To bridge that gap, we’ve assembled a comprehensive list of all 12 Ultimate upgrades for Black Flag Resynced.

Need further assistance navigating Black Flag Resynced? Explore our dedicated collection of tips, tricks, and in‑depth guides.

The table below enumerates every Ultimate Ship Upgrade in Black Flag Resynced. If you’re hunting for a particular enhancement, simply click the link to learn its precise location.

Finding the Hull Armor Plan is a breeze. Navigate to the San Ignacio Wreck at coordinates 352, 744, where a glowing marker indicates the diving bell’s location. Submerge and make your way to the far rear of the wreck; there you’ll discover a sizable treasure chest containing the coveted Hull Armor Plan.

The Kabah Ruins, located at 738, 120, also require the diving bell. Dive deep, then glide to the back of the site—just as the map illustrates—to uncover the Round Shot Strength Ultimate Plan. Watch out for a nearby shark that patrols the waters, adding a splash of danger to the hunt.

The Antocha Wreck at 600, 636 is another diving bell destination. Submerge, then head to the right side of the wreckage; there, a treasure chest holds the Mortars Ultimate Plan.

In a notable shift from the original Black Flag, the map at Ambergris Key (30, 159) can be accessed without deploying the diving bell.

In the latest update, players will discover a hidden zone marked by a broken shade sale and a prominent opening at the top of the background, as illustrated in the screenshot we supplied. Navigating through this area requires swimming toward the entrance and plunging beneath the surface, where a lengthy tunnel awaits.

Midway through the tunnel, a sheltered cove offers a brief respite for air, allowing adventurers to regroup before pushing forward. At the tunnel’s terminus, a handful of enemies guard the path to the Ambergris Key, which is located on the second floor and ready for collection.

Once the key is secured, the map will direct you to Misteriosa at coordinates (270, 175). From the highest point in Misteriosa—where the synchronized fast‑travel hub is situated—seek out the waterfall positioned behind you. Digging near this waterfall will reveal a hidden treasure chest on the left side of the area.

To access Devil’s Eye Caverns at (453, 331), you’ll need the diving bell. After deploying the bell, immerse yourself underwater and swim to the exact location indicated on the map.

To locate the coveted Swivel Ultimate Plan, you’ll need to navigate the labyrinthine routes of the map. The correct path lies to the right and stretches northward; the left side, heading south, serves solely as an exit. Upon reaching the marked spot, ascend to the dry land where the treasure chest awaits, containing the sought-after Swivel Ultimate Plan.

For the La Concepcion Wreck (coordinates 150, 272), the diving bell is essential. Once submerged, head straight north from the bell to the pinpointed location shown in the accompanying image. It’s a short distance away, and the chest there holds the Ram Ultimate Plan.

The next objective involves a treasure map hidden on a skeleton at Santanillas’ northeast corner (191, 218). This map directs you to San Juan (454, 462). Unlike the original Black Flag, the diving bell is unnecessary here, but locating the entrance demands careful strategy. Park the Jackdaw slightly inland, then swim toward the small boat highlighted in the image to access the hidden area.