The campaigns available at launch cover three pirates, George Somers, James Riskinner and Joseph Bannister, each historical English privateers of some renown. Each of these campaigns has 10 - 12 chapter stories, and 50 - 60 missions. Each chapter's story becomes available after progressing through 4 or 5 missions, with the option to complete up to 10 to maximize your crew and ship upgrades, gold and fame. Each campaign has a pool of similar missions plus unique missions to draw from.
Note: some time after launching I would like to make tools to create and edit these missions and import/export them from the game so they can be shared.
Missions can contain enemy, allied and neutral ships, islands, islands you may be able to mount defenses on, a port that may be allied or enemy and may have defenses attacking you or your enemies, and ships that join the battle later.
Each mission has a difficulty and reward rating ranked against other missions in the campaign so you have a sense of the risk-to-reward ratio. Their difficulty is symbolized by the color of the marker: green being easiest and red hardest. Chapter stories are designated on the map by a golden ring and crown
Something I hope to implement later is events that can occur during the travel time on your way to and from a mission at each of the day markers signified by the larger dots. These may include being intercepted by enemy forces, opportunities to help or attack ships, and even full diversions (or wild goose chases) to an alternative mission.