Assassin's Creed Black Flag Resynced Wiki

Jackdaw / Elite Design Plans

Heavy Shot Storage Ultimate Plan – Cayman Sound to Petite Caverne

First move

Record heavy-shot rounds left at the failed exchange, then inspect Heavy Shot Storage IV and its current prerequisites before sailing for the Cayman Sound map.

Coordinates
863, 235 (Resynced dig lead)
Area
Cayman Sound clue → Petite Caverne dig
Location
Cayman Sound beach skeleton map → Petite Caverne waterfall dig
Reward
Heavy Shot Storage Ultimate Plan (confirm in the current save)
Last updated October 1, 2026 Ultimate Upgrade Plan Confirm in current build

Player workbench

Find the Heavy Shot Storage Ultimate Plan only if a close-range fight ends because usable rounds run out.

A weak hit needs Heavy Shot Strength; a ship that cannot survive or close the gap needs another lane. Storage helps only after the Jackdaw can fire enough useful heavy shots to exhaust its stock.

Why this entry is useful

An ammunition-left decision joined to a Cayman Sound map → Petite Caverne dig ledger, a cave-landmark recovery, and a one-variable capacity retest.

A current Resynced specialist guide places the beach-skeleton map near Cayman Sound 298, 311 and the Hutia-area waterfall dig near Petite Caverne 863, 235. This was not first-hand tested here; the live map, reward and menu govern.

Safe first move

Record heavy-shot rounds left at the failed exchange, then inspect Heavy Shot Storage IV and its current prerequisites before sailing for the Cayman Sound map.

Finish line

The Petite Caverne dig yields Heavy Shot Storage Ultimate Plan, the harbourmaster menu accepts the capacity upgrade, and a repeatable close-range pass shows whether the extra stock matters.

Route picker

What are you trying to do with this entry?

Choose one decision and follow 3 checks in order.

  1. ClueAt the failed sea exchange, write down whether heavy-shot rounds reached zero while the Jackdaw still had a safe firing position. If rounds remain, solve range, survival or damage before chasing capacity.
  2. DigOn Cayman Sound's beach near 298, 311, inspect the skeleton and confirm the treasure map entered inventory. The map pickup is not the buried plan.
  3. CompareEnter Petite Caverne, use the Hutia hunting icon to locate the southern cave area, then search behind rocks by the waterfall around 863, 235. Open the dig, read the named Ultimate Plan and check Heavy Shot Storage IV separately at the harbourmaster.
Plan it here, then confirm each marker, objective, reward, or counter in your save.
1 focused entry 5 fact fields 1 coordinate signal Reward-linked
Safe first moveUse the selected route

Start with the first check above and keep the confirmed area, marker, or objective beside the next move.

Risk to avoidProtect the route

A weak hit needs Heavy Shot Strength; a ship that cannot survive or close the gap needs another lane. Storage helps only after the Jackdaw can fire enough useful heavy shots to exhaust its stock.

Save proofKnow when it worked

The Petite Caverne dig yields Heavy Shot Storage Ultimate Plan, the harbourmaster menu accepts the capacity upgrade, and a repeatable close-range pass shows whether the extra stock matters.

How to use it

Keep clue ownership, buried reward and installation separate

The beach map, Petite Caverne dig and Heavy Shot Storage IV purchase are three states. Resolve only the missing state; do not repeat both islands after a successful chest opening.

Recovery path

The dig or menu stays locked

If the cave dig is absent, reopen the Cayman Sound map in inventory and recheck the southern Hutia marker and waterfall rocks. If the named plan is owned but the menu remains locked, inspect Harbormaster III, today's price and any missing requirement. If the fight fails with rounds left, return to Heavy Shot Strength or positioning.

Count rounds → beach clue → cave dig

  1. At the failed sea exchange, write down whether heavy-shot rounds reached zero while the Jackdaw still had a safe firing position. If rounds remain, solve range, survival or damage before chasing capacity.
  2. On Cayman Sound's beach near 298, 311, inspect the skeleton and confirm the treasure map entered inventory. The map pickup is not the buried plan.
  3. Enter Petite Caverne, use the Hutia hunting icon to locate the southern cave area, then search behind rocks by the waterfall around 863, 235. Open the dig, read the named Ultimate Plan and check Heavy Shot Storage IV separately at the harbourmaster.

Route Plan

How to use Heavy Shot Storage Ultimate Plan – Cayman Sound to Petite Caverne

The Resynced Heavy Shot Storage plan is a two-stop treasure route: take the skeleton map on Cayman Sound's beach near 298, 311, then search Petite Caverne's southern Hutia area behind the waterfall rocks near 863, 235. Check the named plan and storage menu separately.

  1. Check whether heavy-shot rounds actually run out in a survivable close-range exchange; if hits are weak, compare strength instead of storage.
  2. At Cayman Sound, collect the map from the beach skeleton near 298, 311 and confirm it appears in treasure-map inventory.
  3. In Petite Caverne, find the Hutia hunting marker in the southern cave, search behind the rocks by the waterfall near 863, 235, then verify Heavy Shot Storage Ultimate Plan and the harbourmaster upgrade line.

Save Checklist

Save Checklist

Use these checks before marking Heavy Shot Storage Ultimate Plan – Cayman Sound to Petite Caverne complete.

  • Entry type: Ultimate Upgrade Plan.
  • Recommended check: Check Jackdaw menu.
  • Main risk: Sailing straight to Petite Caverne without owning the Cayman Sound clue or buying capacity for a damage failure wastes the route.
  • Confirm the marker, reward, or requirement in the current Resynced build.
  • Open next: elite design plans/elite heavy shot.

Upgrade Lane

Upgrade Lane

Treat this as a ship-power decision, not just a map pickup.

  • Confirm whether the upgrade improves storage, armor, broadside, mortar, ram, fire barrel, harpoon, or heavy shot power.
  • Use 863, 235 for the map check before leaving port.
  • Match the upgrade lane to the naval fight that is actually blocking you.

Before Spending

Before Spending

The Jackdaw menu should decide whether this route is worth the sail.

  • Check whether the upgrade is already installed or still locked.
  • Compare the plan against your current failure: sinking, low damage, weak range, bad approach, or storage pressure.
  • Group nearby treasure maps and location checks into the same route.

Naval Retry Prep

Naval Retry Prep

Use the upgrade only when it changes the next sea fight.

  • Restock ammunition before retrying forts, contracts, or legendary ships.
  • Use mortars for safer openings when close approach is the problem.
  • Return to Naval after the plan is installed so the fight route matches the new ship power.
MapCoordinates, regions, cities, islands, and forts.CollectiblesFragments, chests, shanties, keys, and stelae by region.Treasure MapsPickup clues, dig spots, and rewards.JackdawHull, broadside, mortars, ram, and elite plans.

Common Questions

When is Heavy Shot Storage the right upgrade instead of Heavy Shot Strength?

Choose storage only when the Jackdaw safely reaches close range and runs out of useful heavy-shot rounds. Weak damage from each landed hit calls for Strength; losing the ship before closing calls for survival or a different approach.

Where are the Cayman Sound clue and Petite Caverne plan?

Take the treasure map from a beach skeleton near Cayman Sound 298, 311. In Petite Caverne, use the southern Hutia hunting marker to find the rocks by a waterfall near 863, 235, then verify the named Ultimate Plan from the buried reward.

Why is Heavy Shot Storage IV still locked after the dig?

Owning the plan is separate from installing the upgrade. Reopen the current harbourmaster menu, check Harbormaster III and the displayed price or other prerequisite, and only then decide whether capacity fits the next encounter.