Variation

Definitions

• Compass error caused by the difference in the physical locations of the magnetic north pole and the geographic north pole.
• The angular difference between true north and magnetic north; indicated on charts by isogonic lines.

References

• Helicopter Flying Handbook, Federal Aviation Administration, 2019
• Instrument Flying Handbook, Federal Aviation Administration, 2014
• Rotorcraft Flying Handbook, Federal Aviation Administration, 2000