FAA Ground School Practice Test

What is the general purpose of magnetic variation in aviation?

1. To relate true north to magnetic north

2. To determine airspeed

3. To identify altitude

4. To adjust for compass errors

The correct answer is: To relate true north to magnetic north

Magnetic variation refers to the angle between true north and magnetic north at a specific location on the Earth's surface. The general purpose of understanding magnetic variation in aviation is to relate true north to magnetic north, which is crucial for accurate navigation. Aircraft navigation relies heavily on instruments that may reference either true north or magnetic north. Pilots must adjust their navigation methods to account for this variation, which can change based on geographic location. The magnetic compass in an aircraft indicates magnetic north, but to accurately navigate, pilots often need to convert their headings from magnetic to true bearings using the magnetic variation. This knowledge ensures that pilots can accurately interpret headings provided on charts and effectively navigate toward their destinations. By recognizing the difference between these two references, pilots can adjust their flight plans and navigation techniques appropriately, maintaining safety and accuracy in their operations.