Isogonic lines

Definitions

• Lines drawn across aeronautical charts to connect points having the same magnetic variation.
• Lines on charts that connect points of equal magnetic variation.

References

• Helicopter Flying Handbook, Federal Aviation Administration, 2019
• Instrument Flying Handbook, Federal Aviation Administration, 2014
• Pilot's Handbook of Aeronautical Knowledge, Federal Aviation Administration, 2023
• Rotorcraft Flying Handbook, Federal Aviation Administration, 2000