Definition
A satellite-based precision approach and landing system that uses augmented GPS signals to provide aircraft with vertical and lateral guidance accurate enough to support instrument approaches down to and including landing. Ground stations near the airport monitor satellite signals, calculate correction data, and transmit it to aircraft to improve positioning accuracy beyond what raw GPS alone can provide.
Plain English
A landing aid that uses GPS satellites, sharpened by ground-based corrections, to guide an aircraft accurately down to the runway in poor visibility.
Context Anchor
Seen in instrument approach discussions, aircraft navigation equipment, and approach procedures for runways equipped to support this type of landing guidance.
Derivation
‘Global’ refers to the worldwide reach of the satellite navigation network it relies on. ‘Landing System’ signals that this is a guidance aid used during the approach and touchdown phase, not just for en route navigation.
Why Pilots Care
It enables precision approaches at airports that lack traditional ILS equipment, expanding safe landing options in low visibility.
Grounding Statement
The aircraft receives position information, compares it with the desired path to the runway, and shows the pilot how to stay on that path.
Intuition Check
“Global” does not mean every runway in the world has this system. Here, it means the system is based on satellite navigation signals that can be used worldwide when the proper local equipment and approvals are in place.
Example Sentence 1
The airport installed a Global Landing System to allow precision approaches to a runway that was not equipped with ILS.
Example Sentence 2
Training on the Global Landing System prepares pilots for operations at smaller airports using augmented GPS guidance.