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GPS Jammers in the Wild

Guardian:.

The “jammers” put out radio signals at the same frequency at the Global Positioning System (GPS) satellites, overwhelming the timing signal that in-car devices use to plot their position. That means a tracker device built into a lorry with a valuable load, or a car with an anti-theft GPS device which should report its position if stolen, cannot distinguish the correct GPS signal.

“It disappears from the radar,” said Professor David Last, of the University of Wales at Bangor, who has been a police expert witness in a number of cases over the past 18 months in which GPS jammers have been seized.

Some German drivers are also believed to use such jammers to try to evade GPS-based road charging, which was introduced for trucks in 2005. There have also been robberies in Russia where such jammers have been used against both GPS systems and mobile phones on lorries to prevent the driver from contacting the authorities.



-Shlok
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