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Israeli planes mysteriously lose GPS signal over Tel Aviv Airport
They blame Russia, according to this.
[ALMASDARNEWS] The Israel Airports Authority (IAA) confirmed reports that "many" pilots had been losing their Global Positioning System (GPS) signals mid-air, and that the problem has been occurring for the last three weeks. The issue affected airplanes in-flight near the airport, however, the ground systems had been totally unaffected.

An aviation source told Haaretz newspaper that the interruptions occur only during daytime, but "do not put pilots and passengers at risk."

The IAA also assured that "at no stage has there been a safety incident stemming from the GPS disruption in the context of the precision of navigation and flight corridors."

However,
you can observe a lot just by watching...
 the reason behind the disruptions of the signal remains unclear.

The Israeli army’s front man told Haaretz that the incident had no effect on the Israel Defense Forces’ activity and that the army is assisting with "technological measures, in order to ensure freedom of action in Israel’s airspace."
The Times of Israel adds:
The Russian embassy in Israel dismissed the allegations as "fake news" that they "couldn’t respond to seriously."

The interference with the airplanes’ GPS reception appears to stem from a form of electronic warfare known as "spoofing," which Russia has been accused of doing in the past as a defensive measure, despite the disruptions it causes to nearby aircraft and ships.
Posted by: Fred 2019-06-28
http://www.rantburg.com/poparticle.php?ID=544394