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What do isogonic lines on an aeronautical chart connect?

  1. Points of equal magnetic variation
  2. Points of equal compass deviation
  3. Points of equal wind speed
  4. Points where variation is zero
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Correct answer: Points of equal magnetic variation

Isogonic lines are broken magenta lines that connect points of equal magnetic variation.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 16: Navigation — Variation, page 393

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Questions last reviewed: 18 October 2026