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The annunciator of a remote indicating compass system is used when:
  • A
    compensating for deviation.
  • B
    setting the heading pointer.
  • C
    setting local magnetic variation.
  • D
    synchronizing the magnetic and gyro compass elements.
The annunciator circuit is located between the precession amplifier and the precession coil. A typical rate for the gyro to automatically align with the detector unit output is 2º per minute. It helps the pilot to manually synchronize the instrument by indicating to the pilot in which way to turn the compass. Another annunciator’s function is to indicate to the pilot that magnetic monitoring is taking place and the gyro is being precessed to properly align the compass.
  • When the annunciator is flicking between the indications, either a dot and a cross or a plus and a minus, it shows the compass slaving is working correctly. When it indicates full deflection in one direction it shows that the gyro and compass systems are out of alignment.

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