This unlocks at notoriety 21. You'll receive a quest to visit Will Turner.

Navy Decorations
Navy Decorations
  • Companion of Honor Medal (Rarity: Common) (Value: 10 gold)
  • Conspicuous Attendance (Rarity: Common) (Value: 10 gold)
  • Distinguished Obedience Pin (Rarity: Uncommon) (Value: 25 gold)
  • Effort Ribbon (Rarity: Common) (Value: 10 gold)
  • Good Conduct Medal (Rarity: Common) (Value: 10 gold)
  • Illustrious Baton (Rarity: Common) (Value: 10 gold)
  • Noteworthy Bravery Pin (Rarity: Common) (Value: 10 gold)
  • Obsequious Order Badge (Rarity: Common) (Value: 10 gold)
  • Pirate Slayer Mark (Rarity: Rare) (Value: 100 gold)
  • Royal Favor (Rarity: Uncommon) (Value: 25 gold)
  • Sash of Pleasantry (Rarity: Common) (Value: 10 gold)
  • Survivor’s Medal (Rarity: Common) (Value: 10 gold)
  • Valiant Cross (Rarity: Uncommon) (Value: 25 gold)
  • Veteran Insignia (Rarity: Common) (Value: 10 gold)
Referenced by 1 page pages that link to “Treasure Unlock: Navy Decorations” — its place in the wiki