Which marker sequence along the ILS approach path correctly lists outer, middle, and inner markers from farthest to nearest?

• A. DME, VOR, TACAN markers.
• B. Beacon, compass locator, inner marker.
• C. Outer marker, middle marker, inner marker along the approach path.
• D. Glideslope, localizer, marker beacon.

Answer: (C)

Marker beacons along an ILS provide distance cues as you fly the final approach. The sequence runs from farthest to nearest along the approach path: the outer marker is encountered first, then the middle marker, and finally the inner marker closest to the runway. This ordering aligns with how each beacon is positioned and gives you successive distance references to confirm you’re on the correct inbound course and near the decision area. Therefore, the option that lists outer marker, then middle marker, then inner marker along the approach path is the correct one.

The other options mix in nav aids or components not part of the marker sequence: DME, VOR, and TACAN markers refer to different navigation aids; a term like beacon, compass locator, and inner marker doesn’t reflect the standard three-marker progression; and glideslope and localizer are parts of the ILS system itself, not the marker beacons, so they don’t describe the marker sequence along the approach path.