GBAS provides which ILS categories?

• A. Cat II and III ILS
• B. Cat I ILS
• C. Cat III ILS
• D. Localizer Only

Answer: (A)

GBAS provides precision approach guidance by augmenting GPS with a ground-based correction and integrity system, delivering accurate lateral and vertical guidance to aircraft. That capability is designed to support ILS-type performance at the Cat II and Cat III level, enabling lower minimums and operations in poorer visibility when the runway system and aircraft equipment permit. Localizer Only would not provide vertical guidance, and while GBAS can also yield Cat I-like minima in some deployments, its intended strength is the Cat II/III level of precision, which is why this option best matches what GBAS offers.