Definition
A Head-up Guidance System (HGS) is a cockpit display that projects flight information and guidance symbology onto a transparent combiner positioned in the pilot's forward line of sight, allowing the pilot to read airspeed, altitude, attitude, flight path, and approach guidance while continuing to look outside the aircraft. It is most commonly used to support low-visibility takeoffs and approaches, including certain Category II and Category III operations, by giving the pilot precise visual guidance without needing to look down at the instrument panel.
Plain English
A see-through display in front of the pilot's eyes that shows all the important flight information, so the pilot can keep looking out the windshield instead of glancing down at the instruments. It is especially useful when landing in poor visibility.
Context Anchor
Seen in instrument approach, low-visibility landing, and advanced cockpit equipment discussions.
Derivation
Called 'head-up' because the pilot keeps their head up and eyes forward rather than 'head-down' on the instrument panel. The concept came from military fighter HUDs (Head-Up Displays), later adapted for airline and business aviation use.
Why Pilots Care
Improves situational awareness and reduces transition time between instruments and the outside view, supporting safer precision approaches in marginal weather.
Intuition Check
Do not assume the HGS flies the aircraft by itself. It provides guidance in the pilot’s forward view; the pilot or another flight control system still has to control the aircraft.
Example Sentence 1
The crew briefed the use of the HGS for the Category III approach into a fog-bound airport.
Example Sentence 2
During the low-visibility landing, the HGS displayed the runway symbol and glide path cue directly in the pilot's view.