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mediumgyroscopic-instruments

The heading indicator must be periodically realigned with the magnetic compass because of:

Q: The heading indicator must be periodically realigned with the magnetic compass because of:

Gyroscopic precession (real and apparent drift). Mechanical friction and apparent drift (Earth's rotation) cause the DG to precess away from the correct heading over time.

Magnetic variation

Compass deviation

Gyroscopic precession (real and apparent drift)

Coriolis effect only

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