Plain English Meaning

It's the radio signal a ground station uses to send GPS correction data and approach path information up to the aircraft, so the aircraft can fly a precise GPS-based approach to the runway.

Full Definition

A digital radio transmission, in the 108.025–117.950 MHz VHF band, used by a Ground-Based Augmentation System (GBAS) ground station to send GPS correction data, integrity information, and approach path definitions to aircraft. The broadcast allows a properly equipped aircraft to compute precision approach guidance to a GBAS-served runway.

Context Anchor

Seen in GBAS approach discussions, where the aircraft must receive the ’s GBAS broadcast before it can use GBAS guidance.