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How to look for a gps on your vehicle
To check for one on your car, you need to inspect underneath and around the periphery of your car.
First you should learn a standard gps device.
Typically, gps units have two parts, the electronics component and the antennae respectively.
The electronic component is usually in a plastic case with a magnet on the bottom, and connected by a wire to its antennae. Generally, the electronics unit is much larger than the antennae.