***Definition*** :: The angle between True North and Magnetic North. It is expressed as east variation or west variation. Pilots planning navigation by compass must adjust headings to account for Magnetic Variation. > [!summary] From [[PHAK Ch8]] > The magnetic North Pole to which the magnetic compass points is not collocated with the geographic North Pole, but is some 1,300 miles away.... > > In aerial navigation, the difference between true and magnetic directions is called variation. ![[Compass Variation Across US.jpeg]] See Also [[Compass Errors]] ***Source*** :: [[PHAK Ch8]] #glossary