ring Captain's Sphere of Influence

Captain purple
  Final word on heading and plunder,
  keeper of the ship's charter.

Quartermaster blue
  Second-in-command, arbitrates
  disputes, divvies the booty.

Crew green
  Deckhands, gunners, and powder
  monkeys aboard the ship.

Allied Crews orange
  Loose alliances kept by oath
  or shared bounty in fair seas.

The Open Sea cyan
  Weather, currents, and rival
  flags beyond any captain's reach.