New Delhi, Dec. 2 -- GPS spoofing signals were received over the past month at the Delhi, Mumbai, Chennai and other airports although no flight movements were affected, civil aviation minister Ram Mohan Naidu informed Parliament on Monday. GPS spoofing entails sending fake satellite signals to trick a navigation system into showing the wrong position, speed or time. Unlike jamming, which floods the spectrum on which GPS satellites function, spoofing feeds aircraft false but convincing navigation data, which can cause errors in route or altitude and pose serious safety risks. Naidu, in a written response to MP Niranjan Reddy, said, "GNSS interference reports are being received from Kolkata, Amritsar, Mumbai, Hyderabad, Bangalore and Chennai airports." He said that some flights reported GPS spoofing in the vicinity of IGIA (Indira Gandhi International Airport), New Delhi while using GPS-based landing procedures during their approach to runway 10. "Contingency procedures were used for GPS-spoofed flights approaching RWY 10. There were no effects on movements of flights, other runway ends having conventional navigational aids being operational," Naidu said. "The Airports Authority of India (AAI) has also requested the Wireless Monitoring Organization (WMO) to possibly identify the source of interference/spoofing," the minister stated.htc...