FAA Part 107 Remote Pilot (UAG)OperationsMedium
A remote pilot is preparing for a sUAS inspection flight near a large industrial facility that includes high-voltage power lines and radio towers. The pilot notices erratic compass readings during calibration. Which phenomenon is most likely causing this issue?
- AMagnetic interference.
- BAtmospheric pressure changes.
- CTemperature fluctuations.
- DInsufficient GPS satellite lock.
Show answer & explanationAnswer & explanation
Correct answer: A. Magnetic interference.
High-voltage power lines and radio towers are significant sources of electromagnetic fields that can interfere with a sUAS's onboard compass (magnetometer). This interference, known as magnetic interference, directly affects compass readings, leading to erratic behavior.
Why the other options are wrong
- B. Atmospheric pressure changes primarily affect altitude readings, not compass accuracy.
- C. While extreme temperature changes can affect electronics, they are less likely to cause specific 'erratic compass readings' compared to direct magnetic interference.
- D. Insufficient GPS lock affects position accuracy and potentially GPS-dependent flight modes, but not directly the magnetic compass readings.
Magnetic Interference
Magnetic interference (or electromagnetic interference, EMI) refers to external electromagnetic fields that disrupt the sUAS's magnetometer (compass), leading to inaccurate or erratic heading information.
- Caused by power lines, metal structures, magnets.
- Affects sUAS compass/magnetometer.
- Leads to erratic heading or fly-aways.
- Requires recalibration away from sources or flight avoidance.
Memory trick: Compass goes wild? Check the magnetic child!