Detectnu GPS/GSM Jammer. It was inevitable really, that with the maturing of GPS technology, would come the rise of the anti-tech. This puppy, for example, plugs into your car lighter and will jam all GPS sat-nav signals within a radius of 50 metres and GSM phone signals within 20 metres. Fun at the traffic lights, eh? No idea of price or availability, though.

The RJ-G1575 GPS Jammer from Radixon Hadrian is a much more serious bit of kit and will block a GPS signal in a 50 kilometres radius. It’s only for sale to government agencies though, so put the Amex away, Joe.

 The purpose of jamming these signals is, for example, to avoid the use of GPS assisted terrorist attacks. Permanent installations of the HADRIAN RJ-G1575 could include embassies and other sensitive buildings such as national assets. Temporary applications could include larger the shielding of motorcades and convoys, large public events and the temporary deployment of troops or equipment.