If the do-it-yourself version of the GPS jammer is above your skills you may be interested in this GPS and GSM jammer. This GPS / GSM jammer plugs into the cigarette lighter in your car and gives your paronoid self a peace of mind. It is manufactured by a company in Netherlands called DetectNu, however it is not showing in their online shop at this moment.
The device is designed to prevent a GPS logger that may be implemented in your car to collect data and send it back to the base station.
Because GSM jammers will only prevent GPS/GSM tracking devices to communicate with the base station. The GPS/GSM devices are still able to receive and buffer all GPS positions. The tracking devices will still be able to send out all the GPS positions if the car or when the GSM jammer is shut down. So they can still see where you went that day.
Only GPS jammers will prevent the GPS loggers and GPS/GSM devices to get GPS positions from the Satellites. But they still can track you by the GSM network used by the GPS/GSM devices or track you by your mobile phone.
We have a no information on pricing or availability.