The accuracy and reliability of a GPS unit depends on its ability to receive signals from a number of GPS satellites. The GPS unit must have a clear, unobstructed view of the satellites at all times. If this view is obstructed, a GPS receiver is unable to receive or transmit signals and is essentially disabled. Although it sounds like a crazy, tin foil hat joke, a single layer of consumer metal foil can fool any GPS tracking device.
Step
Locate your car or tracker's GPS antenna and receiver.
Step
Wrap the antenna, receiver and wires in regular, store-bought aluminum foil. While one layer of standard 0.2mm aluminum foil should be enough to block radio signals, use two layers to be certain.
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Step
Wrap a layer of duct tape around the aluminum foil wrapping to keep it in place. If the GPS antenna and receiver are in a place that will see a lot of wind when the car is in motion, secure the wrapping in place by taping it to another, stationary object.
