A compass error caused by mechanical disturbances from electrical and metal components, with corrections shown on a compass correction card, is called what?

A compass error caused by mechanical disturbances from electrical and metal components, with corrections shown on a compass correction card, is called what?

• A. Deviation
• B. Direct Control
• C. Cyclic Pitch Control
• D. Density Altitude

Answer: (A)

Deviation is the compass error caused by magnetic fields from the aircraft’s own electrical and metal components. These local disturbances distort the Earth's magnetic field around the compass, making it read incorrectly. A compass correction card provides the specific corrections to apply to each heading to obtain the true magnetic heading, so pilots can compensate for this interference in flight. This is different from variation, which is the difference between true north and magnetic north at a location on the Earth’s surface, and from other terms like density altitude or cyclic control, which are unrelated to compass errors.

Deviation is the compass error caused by magnetic fields from the aircraft’s own electrical and metal components. These local disturbances distort the Earth's magnetic field around the compass, making it read incorrectly. A compass correction card provides the specific corrections to apply to each heading to obtain the true magnetic heading, so pilots can compensate for this interference in flight. This is different from variation, which is the difference between true north and magnetic north at a location on the Earth’s surface, and from other terms like density altitude or cyclic control, which are unrelated to compass errors.