http://www.thenorthernecho.co.uk/display.var.912662.0.0.php?utag=12692
"CAR thieves have been using Bluetooth technology to detect whether a satellite navigation system is hidden in a car. Police in Darlington have renewed warnings to motorists to remove systems from their cars when they leave them unattended. Police discovered that by using Bluetooth technology, the thieves were able to detect whether there was equipment in the car - even if it was in the glove compartment."
