Which device is a low-power L/MF beacon located at the site of the outer or middle marker of an ILS?

• A. Compass rose
• B. Compass locator
• C. Cold front
• D. Coefficient of lift

Answer: (B)

When flying an ILS approach, markers along the approach path provide precise position cues: the outer marker and the middle marker help you know where you are on the final approach. A compass locator is a low-power LF/MF beacon placed at the site of the outer or middle marker to supplement these cue signals. It’s designed to be received by ADF equipment, giving you a reliable marker-indicating signal even if the standard marker beacon transmissions are hard to hear. This makes locating the marker position during the final approach more robust in challenging reception conditions.

The other options don’t fit: a compass rose is just a chart symbol showing directions, a cold front is a weather feature, and a coefficient of lift is an aerodynamic concept. None of those are beacons located at ILS marker sites.