Many businesses worldwide are suffering from GPS signal jammers (blockers).
The small size sensor connected to the GPS/GSM and installed in a hidden place will send the signal once the GPS signal blocking became detected.
If interested, find details here: http://xmetra.com/sensor-detector-gps-s … -spoofing/
JAMMERS IN PRISONS: Characteristics, impact and alternative solutions. GSMA LA ... calls, text messages, GPS positioning signals, data services ... installing signal blockers in prisons, and identifies good practice. ... channel range in which the interference will take place. ... Detection systems use sensors that locate, trace.
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