Aircraft systems and instrumentsQuestion 577 of 934

What should the pilot use when setting the heading indicator to agree with a magnetic compass that is oscillating?

  1. The highest indication during the swings
  2. The lowest indication during the swings
  3. The average indication between the swings
  4. The first indication after the swings start
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Correct answer: The average indication between the swings

Oscillation is a combination of all the compass errors.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 8: Flight Instruments — Compass Systems — Oscillation Error, page 229

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Questions last reviewed: 18 October 2026