Which statement best describes the Localizer's function on final approach?

• A. It provides vertical guidance only via glide slope.
• B. It provides both lateral and vertical guidance for approach.
• C. It provides left/right guidance along the runway centerline during final approach.
• D. It provides distance measurement to the runway threshold.

Answer: (C)

The Localizer provides horizontal guidance, telling you whether you’re left or right of the runway centerline so you can stay aligned with the runway during the final approach. It is part of the ILS, with the Glide Slope handling vertical guidance for descent. The Localizer alone does not give vertical information or distance to the threshold, so the description that emphasizes left/right guidance along the runway centerline best matches its function.