From the developer's website:
During the golden age of pirates at a time when the Caribbean is terrorized by the Pirates of Black Cove, it is your destiny to unite other Pirate factions against them. Pick up missions from different locations and factions that best suit your personal goals and interests. Each mission you accomplish both on land and sea brings you closer to uniting all three pirate factions, defeating the Black Cove Pirates, and finally being the King of all Pirate Factions. The Caribbean has a wealth of treasure and secret locations so be sure to make time for exploration and treasure hunting.
FEATURES:
Roam the open World with Your Pirate crew and pick up missions incrementally
Notoriety and Pirate Fame brings You closer to Your Goal of uniting the factions and taking down Black Cove
Battle it out with the forces of Black Cove and colonial powers both on Land and Sea
Varied units and weapons allows You to carry out the battles as You see fit
Gather pirate captains to Your crew, be sure to keep them in Rum or they'll not serve you well