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India’s Directorate General of Civil Aviation (DGCA) has issued an adendum on reporting procedures for suspected GNSS spoofing, reports news service AIN. On Nov. 10, the DGCA began requiring that all spoofing and jamming incidents be reported within 10 minutes, following an intense period of disruptions around Indira Gandhi International Airport in Delhi.

 The addendum is meant to clarify exactly what pilots and operators are required to do both before and after a GNSS interference incident is suspected.

The disruptions produced false EGPWS alerts, position errors, and incorrect altitude indications, according to OpsGroup. The interference briefly drove ADS-B integrity in the Delhi terminal area to zero, affecting hundreds of aircraft and leaving controllers unable to rely on GPS-based surveillance.

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