The player's ship consists of five systems: Shields, which reduce damage; Hyper Drive, which allows the ship to jump to different grid sectors; Impulse Drive, which allows the ship to move; the Tracking Computer, which locks on to and attempts to follow enemies; and the Battle Computer, which automatically fires at enemies and keeps the ship's laser beams centered. Each of these systems can be turned on and off, and can take damage when the ship is hit by enemy fire, making it less effective or more costly to use. The ship can repair its systems automatically, but while a system is under repair, it rapidly switches on and off, greatly reducing its effectiveness during battle. All actions (including leaving the repair system on when at full health) use energy, of which the ship has a limited supply.