Test yourself: 5 hard theory questions, free Airspace, weather, regs and aerodynamics, FAA-style — instant score, every answer explained. No signup.

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An isogonal is a line on a chart joining points of equal:

Magnetic variation. An isogonal (isogonic line) connects points of equal magnetic variation. An agonic line is where variation is zero.

Magnetic deviation

Magnetic variation

Altitude

Pressure

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See where you stand: 5 hard questions, instant score, every answer explained.