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Electronic devices on board of an aeroplane have influence on the...

  • A

    Turn coordinator.

  • B

    Airspeed indicator.

  • C

    Artificial horizon.

  • D

    Direct reading compass.

The Direct Reading Compass is a crucial instrument used in navigation to determine the direction of an aircraft and operates based on the principles of magnetism. In using the magnetic compass for navigation purposes, there are more considerations than just the turning errors. The magnetic compass displays several errors in its use due to the Earth's magnetic field and the aircraft's magnetic field.

Any material that has magnetic properties will affect the reading of a magnetic compass. The aircraft’s magnetic field is affected of any metal component or electronic device which have their own magnetic field.

Thus, after significant modification to aircraft (install or removal) with any electronic device, a compass swing should be done, where the compass deviation between magnetic north (observed on a landing compass) and compass north (observed in the aircraft) is assessed again across various headings.

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