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What causes compass deviation?

  1. The difference between true north and magnetic north
  2. Wind that pushes the airplane away from the course
  3. Magnetic fields from equipment inside the aircraft
  4. The convergence of meridians near the poles
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Correct answer: Magnetic fields from equipment inside the aircraft

Electrical circuits, radios, lights, tools, the engine, and magnetized metal deflect the compass needle.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 16: Navigation — Deviation, page 395

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Questions last reviewed: 18 October 2026