Vehicle tracking devices operate with Global Positioning System (GPS) technology. To determine location, the GPS receiver captures signals from GPS satellites orbiting the earth.
Placement of the GPS tracking device is important because it will affect the accuracy of the readings and the quality of GPS reception. Usually the best performance is achieved when the receiver, or its antenna, has a view of the sky with few obstructions; or it receives signals reflected off the ground.
Generally, GPS signals will travel unobstructed through materials such as glass, plastic, rubber, fiberglass, carpeting and cardboard. The receiver should not be entirely surrounded by metal or concrete.