AC4: Black Flag – Elite Ship Upgrade Plans Locations Guide

Collect the best upgrades to your pirate ship in Assassin’s Creed 4: Black Flag with Game Front’s guide. Each of these upgrade plans are located in a special chest, often in shipwrecks or other hidden locations. Don’t settle for just second-best pirate in the Caribbean. Plunder with ease — find the best upgrades in the list below.

For even more high-seas guides, check out the Assassin’s Creed 4: Black Flag cheats list, with articles on Easter eggs, secrets, and collectible locations. If you’re in need of help finishing the tough missions in the campaign, browse through the AC4: Black Flag video guide.

Elite Ship Upgrade Plans Locations Guide

Elite Round Shot Strength:

• Location: Kabah Ruins
• Map Coordinates: 769, 145

Elite Hull Armor:

• Location: San Ignacio
• Map Coordinates: 379, 770

Elite Swivel Guns:

• Location: Devil’s Eye Cave
• Map Coordinates: 487, 357

Elite Harpoon Strength:

• Requires: Treasure Map – Mariguana Island (880. 544) – Look on the rocks west-of-center.  
• Location: Andreas Island – Dig on a tiny island with three palm trees on the very southern edge of the area. 
• Map Coordinates: 579, 720

Elite Broadside Cannons Set:

• Location: The Blue Hole
• Map Coordinates: 471, 170

Elite Heavy Shot Storage:

• Requires: Treasure Map – Cayman Sound (327, 334) – Look on the northeastern beach, near a chest.
• Location: Petite Cavern
• Map Coordinates: 901, 263

Elite Heavy Shot Strength:

• Requires: Treasure Map – Ambergris Key (55, 178)
• Location: Misteriosa
• Map Coordinates: 307, 195

Elite Fire Barrel Strength:

• Requires: Treasure Map – Santanillas (217, 250) – Found on the tiny island in the northeast corner. 
• Location: San Juan
• Map Coordinates: 479, 487

Elite Fire Barrel Storage:

• Requires: Treasure Map – Kenway’s Fleet Mission – 3 Missions Unlock Treasure Maps, Empty Cellar (Eastern British Colonies), Scarlatina (Eastern Canada), and Great Reputation II (Mediterranean Sea)
• Location: Isla Providencia – Dig on the beach near an old shipwreck in the water, between three palm trees.
• Map Coordinates: 502, 44

Elite Ram:

• Location: La Concepcion Shipwreck
• Map Coordinates: 181, 296

Elite Mortars:

• Location: Antocha
• Map Coordinates: 630, 660

Elite Mortars Storage:

• Requires: Treasure Map – Tortuga (882, 370) – Walk up the east beach to find.
• Location: Matanzas
• Map Coordinates: 333, 650

Achievement / Trophy Unlocked

• Destroyer (40 Points / Bronze):
  Fully Upgrade the Jackdaw.