Which best describes a localizer in IFR navigation?

Which best describes a localizer in IFR navigation?

• A. A navigation aid providing course guidance to the runway centerline
• B. A vertical guidance system for ILS
• C. A ground speed measurement device
• D. A ground-based radio microphone in the tower

Answer: (A)

The localizer is the horizontal guidance part of the instrument landing system, a ground-based aid that helps you fly the aircraft along the runway centerline during an approach. It transmits a VHF signal from the far end of the runway and provides left-right deviation information to the cockpit, guiding you to align with the runway centerline. Vertical guidance for the approach comes from the glideslope, which is a separate component. A ground speed measuring device or a ground-based microphone in the tower aren’t navigation aids. So the best description is that it provides course guidance to the runway centerline.

The localizer is the horizontal guidance part of the instrument landing system, a ground-based aid that helps you fly the aircraft along the runway centerline during an approach. It transmits a VHF signal from the far end of the runway and provides left-right deviation information to the cockpit, guiding you to align with the runway centerline. Vertical guidance for the approach comes from the glideslope, which is a separate component. A ground speed measuring device or a ground-based microphone in the tower aren’t navigation aids. So the best description is that it provides course guidance to the runway centerline.