Jeppesen’s Airframe Oral & Practical (O&P) Practice Exam

Magnetic fields generated by electrical equipment can interfere with the normal operation of a magnetic compass by creating additional magnetic forces in its vicinity. This interference can cause the compass to deflect from the true direction indicated by the Earth's magnetic field, leading to inaccuracies in navigation.

When strong magnetic fields from electrical equipment are present, they can alter the orientation of the compass needle by exerting opposing forces. This deflection can result in the compass pointing towards the magnetic field of the equipment rather than aligning properly with the Earth's magnetic field.

Understanding this effect is crucial for pilots and navigators, as it highlights the importance of ensuring that magnetic compasses are located away from sources of magnetic interference to maintain accurate navigation.