Multiple choice

Alternate dots and dashes modulated with a 1300 Hz tone is the indication of which marker beacon?

  1. Inner

  2. Center

  3. Outer

  4. Middle
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Marker beacons use different audio and light signals to indicate position along the approach path. The Outer marker has continuous dashes at 400 Hz, the Middle marker has alternating dots and dashes at 1300 Hz, and the Inner marker has continuous dots at 3000 Hz. The middle marker indicates you're approaching the decision height for Category I ILS approaches.

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