Which term refers to the magnetic field generated by the aircraft itself?

The term that refers to the magnetic field generated by the aircraft itself is deviation. Deviation occurs when the magnetic compass in an aircraft is influenced by the magnetic fields produced by onboard equipment, electronic devices, and the aircraft’s metallic structure. This results in an error in the compass readings, leading to a difference between the true magnetic direction and what the compass indicates.

Understanding deviation is crucial for pilots because it highlights the importance of accounting for these errors when navigating. Compasses are essential for determining headings, and any inaccuracies must be understood and corrected to ensure safe and precise flight operations. Other options, while related to magnetic navigation, do not refer specifically to the aircraft-generated magnetic field.