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Which one of the following disturbances is most likely to cause the greatest inaccuracy in ADF bearings?
  • A
    Coastal effect
  • B
    Quadrantal error
  • C
    Precipitation interference
  • D
    Local thunderstorm activity

Thunderstorms can have very powerful discharges of static electricity across the electromagnetic spectrum including in Low Frequency (LF) and Medium Frequency (MF). These discharges cause the most severe errors in NDB/ADF.

A static discharge in a Cumulonimbus cloud (CB) can be heard as a loud crackle on the audio and the needle will move rapidly to the source of the CB. If there are several active thunderstorms in the area the needle might point to them for a longer period.

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