The primary displays for the heading reference system are the Captain and F/O's HSI and RDDMI compass cards.
Two compass control panels are located on the pilot's overhead. A selector switch for MAG or DG is provided. When MAG is selected the MAG light on the switch is on in this case:
- Gyro reference switches to Magnetic north.
- May be slewed but will realign to MAG north.
- Sync indicator shows difference between indicated heading and MAG heading
The DG's automatically align to MAG north at a rapid rate when electrical power is applied.
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