A sector is a single unit represented as a square on the command map. A player may own any number of sectors under their command.
When a sector is owned by a player, a small image is shown on the map. Sectors that are not owned are shown on the map as empty black space.
At the start of a player's turn, each sector they own is given at least 1 action point. Those action points will expire at the end of the player's turn.
The number of owned sectors determine the amount of credits a player earn at the start of their turn and the maximum number of ships a player may command.
A sector may hold any number of friendly ships at a time.