GPS spoofing is an attack in which a radio transmitter located near the target is used to interfere with a legitimate GPS signals. The attacker can transmit no data at all or could transmit inaccurate coordinates. In March, at the Geneva Motor Show in Switzerland, an attack from an unknown source affected the GPS systems of Audi, Peugeot, Renault, Rolls-Royce, Daimler-Benz and BMW cars. The smallest devices are a little bigger than a smartphone and cost around $100.”]