The Galileo HUD is a mask-mounted, hands-free dive computer, sold here without a transmitter. It uses near-eye optics to project a virtual heads-up display showing dive data without requiring the diver to look at a wrist or console unit. Menu navigation is via a push-wheel knob, and the screen tilts up and out of the way when not in use. Without a transmitter, tank pressure is not displayed; a transmitter can be added separately for air integration.