Here's more detail of "What is GPS Receivers vs. Tracking" from Ready-Market Online Corporation
GPS tracking devices that couple a GPS receiver with a wireless transmitter,
GPS Receivers vs. Tracking
There is a popular misperception that GPS is a "tracking" technology and therefore that it can be easily misused by public agencies and private companies to monitor people's whereabouts. In reality, a GPS receiver is just that, a receiver. It knows its location (latitude, longitude, altitude, compass heading, and speed) anywhere on Earth, within about 30 feet. (Differential GPS receivers can achieve an accuracy of a few millimeters.) However, several companies now produce GPS-based tracking devices that couple a GPS receiver with a wireless transmitter, usually using the control channel on a cellular network. These devices relay the position of a vehicle to a tracking center. Someone who purchases a handheld GPS receiver at a sporting goods store or a car GPS receiver at an electronics store need not fear that Big Brother will hence always know her or his whereabouts. However, someone renting a car or a boat might ask whether the vehicle is equipped with a GPS receiver and a transmitter, as rental companies often track their vehicles.
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