Car remote jammer | phone jammer car history
The device you have described is a complex electronic high-tech device with a bunch of technological advantages inside. But let me explain the details of their operation step by step.
First thing is the integrated, autonomous and assisted GPS, or so called A-GPS. You can treat this one as improved version of the common GPS because it really is and there are few reasons for that. First of all, A-GPS uses not only GPS satellites for location finding. It also enables connection with the cell phone towers and using data provided by your mobile carrier triangulates your location between the closest cell phone towers. Only after that A-GPS uses satellites to calculate your coordinates precisely. Secondly, it has quick start thanks to the cell phone tower triangulation. But not every A-GPS unit can work without mobile phone signal. It depends on the microchip it uses.
Second things are chipset and microchips this Motorola PDA MC-75 uses - SiRFstarIII GSC3f/LP chipsetA. Those are all modern high-tech chips which are perfectly tuned to work with GPS L1 band and receive even low-power satellite signals. Combine it with the ability to triangulate your approximate location between cell phone towers and you will get powerful location finding tracker that is not as easy to jam as it seems, so GP5000 car GPS jammer will probably not handle this situation.
In order to be absolutely sure that you are secure from such tracking you can use FF-15 Universal Jammer to block Motorola PDA MC-75 A-GPS signal, stopping it from using cell phone towers and GPS satellites to track you.