Jackdaw / Elite Design Plans

Harpoon Strength Ultimate Plan – Mariguana to Andreas Island

First move

Only chase this lead when a harpoon hunt is the active blocker; confirm the Mariguana map first, then set Andreas Island as the dig destination.

Coordinates: 544, 693 (Resynced dig lead)
Area: Andreas Island
Location: Mariguana cave map → Andreas Island south-islet dig
Reward: Harpoon Strength Ultimate Plan (confirm in the current save)

Last updated October 3, 2026 Jackdaw Upgrade Confirm in current build

Player workbench

Carry the Mariguana clue to Andreas Island for a harpoon-strength plan only when hunting needs it.

A harpoon plan can consume travel time while leaving the Jackdaw's cannon, hull, and mortar blockers unchanged.

Why this entry is useful

A hunting-versus-warship priority check joined to Mariguana's leaf-hidden cave and Andreas Island's southern-islet dig.

A third-party route guide is the sole located lead for the Mariguana cave map near 847, 514 and the Andreas Island southern-islet dig near 544, 693. Treat these as leads, not current-save proof; confirm the live sketch, shovel prompt, named plan reward and Jackdaw menu state.

Safe first move

Only chase this lead when a harpoon hunt is the active blocker; confirm the Mariguana map first, then set Andreas Island as the dig destination.

Finish line

Confirm Harpoon Strength Ultimate Plan by name, record its ownership or availability in the current Jackdaw menu, and compare a repeatable hunt; claim an improvement only if that retest shows one.

Route picker

What are you trying to do with this entry?

Choose one decision and follow 3 checks in order.

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 harpoon plan can consume travel time while leaving the Jackdaw's cannon, hull, and mortar blockers unchanged.

Save proofKnow when it worked

Confirm Harpoon Strength Ultimate Plan by name, record its ownership or availability in the current Jackdaw menu, and compare a repeatable hunt; claim an improvement only if that retest shows one.

How to use it

Keep hunting and combat budgets apart

The Mariguana leaf-hidden cave holds the map, while Andreas Island's southern small island holds the chest. This hunting plan should not interrupt a fort or legendary-ship build.

Recovery path

The blocker is a warship

If a naval fight remains the blocker, return to hull, cannon or mortar diagnosis. If the chest is absent, check map ownership at Mariguana 847, 514 and the separate Andreas 544, 693 dig before repeating either sail.

Hunt need → Mariguana clue → Andreas dig

Identify the target activity: sea-animal hunting points here; forts and legendary ships point to different Jackdaw systems.
Approach Mariguana's map icon from the north near 847, 514; in the small cave, crouch through the leaf-covered tunnel to find the map.
Use the map sketch to reach the small islet south of Andreas Island near 544, 693; follow the current shovel prompt, then confirm the named plan and its menu ownership state before comparing a similar hunt.

Route Plan

How to use Harpoon Strength Ultimate Plan – Mariguana to Andreas Island

Keep the two stops separate: first collect the treasure map in Mariguana's leaf-hidden cave near 847, 514, then use that clue to dig on the small islet south of Andreas Island near 544, 693. Treat both coordinates as route leads until the current map, sketch, and shovel prompt agree; verify the named plan and Harpoon Strength menu state afterward.

At Mariguana, enter the leaf-covered cave from the north and collect the treasure map near 847, 514; this is the clue pickup, not the buried plan.
Read the map sketch, sail to the small islet south of Andreas Island, and check the dig near 544, 693 against the current marker and shovel prompt.
After opening the chest, confirm Harpoon Strength Ultimate Plan by name and check whether Harpoon Strength IV is owned, available, or still locked in the current Jackdaw menu.

Save Checklist

Use these checks before marking Harpoon Strength Ultimate Plan – Mariguana to Andreas Island complete.

Entry type: Jackdaw Upgrade.
Recommended check: Check Jackdaw menu.
Main risk: Spending the naval-upgrade session on a hunting-only route can delay the actual blocker.
Confirm the marker, reward, or requirement in the current Resynced build.
Open next: treasure maps.

Upgrade Lane

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

Confirm that a sea-animal hunt—not a fort, legendary ship, or general naval-damage problem—is the repeatable blocker before sailing for this plan.
Check the current Jackdaw menu for Harpoon Strength IV and record whether it is owned, purchasable, or missing a requirement; the treasure route itself does not prove installation.
If the plan is installed, compare one repeatable hunt under similar conditions and record the result before concluding that the upgrade changed hunting performance.

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.

Hunt Retest

Treat the hunt as a controlled check of the installed upgrade, not as proof from the plan pickup alone.

Confirm Harpoon Strength IV is installed in the current Jackdaw menu before beginning the comparison.
Repeat a comparable sea-animal hunt and keep the approach and target conditions as consistent as practical.
Record the result without assuming a benefit; if the blocker is a naval fight, use its combat lane instead.

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

How do I reach Harpoon Strength Ultimate Plan – Mariguana to Andreas Island?

For Harpoon Strength Ultimate Plan – Mariguana to Andreas Island, start from Andreas Island and confirm the 544, 693 plan marker. Use the Mariguana leaf-hidden cave clue to Andreas Island south-islet chest and north cave entry and southern small-island dig check to identify the pickup approach, then keep the source clue and the plan name together before returning to the Jackdaw menu.

What should I verify after collecting Harpoon Strength Ultimate Plan – Mariguana to Andreas Island?

At Andreas Island, verify that the current ship menu accepts Harpoon Strength Ultimate Plan – Mariguana to Andreas Island; compare the recorded “Harpoon Strength Ultimate Plan (confirm in the current save)” signal with the 544, 693 plan marker instead of treating a visible map icon as an installed upgrade. Repeat the same naval opening that caused the problem so you can tell whether the plan changed survival, damage, range, control, or capacity.

What if Harpoon Strength Ultimate Plan – Mariguana to Andreas Island is visible but cannot be installed?

For Harpoon Strength Ultimate Plan – Mariguana to Andreas Island, keep the 544, 693 plan marker as the confirmed pickup, then check the Harbourmaster or Captain's Cabin for the missing prerequisite and materials. Do not buy another lane until the menu names the blocker around Andreas Island.