Get Ready to Soar: Master Initial Maneuvers Training (IMT) 1 Exam 2026!

When EFIS magnetic readings are known to be unreliable, you want a heading source that isn’t affected by those measurements. Selecting MAG uses the magnetic heading from the standby magnetic compass, providing a simple, independent reference for the EFIS and flight guidance during takeoff and initial climb. This gives a stable, direct heading to rely on when the EFIS magnetometer is compromised. The other sources rely on gyro/INS or nav data that can drift or may still be influenced by interference, making them less dependable during this critical phase.