Aircraft systems and instrumentsQuestion 567 of 934

What is true along the agonic line?

  1. The variation is 10° east
  2. The deviation is zero
  3. The magnetic dip is zero
  4. There is no variation
Show answer

Correct answer: There is no variation

The agonic line is where the geographic and magnetic poles align. An isogonic line is a line of equal variation.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 8: Flight Instruments — Compass Systems — Magnetic Compass Induced Errors, page 226

Practice aircraft systems and instruments

Questions last reviewed: 18 October 2026