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The Global Positioning System (GPS) is a satellite-based navigation structure which consists of a network of 24 satellites positioned into trajectory by the U.S. Department of Defense. GPS satellites circle the earth twice a day in a very precise orbit and transmit signal information to earth. The GPS receivers on earth take this information and use triangulation to calculate the user’s exact location.

The GPS trackers are the ones which use the Global Positioning System to locate a person, vehicles or any other object and trace its location at standard intervals. This data can be recorded and transmitted to a computer server or to a central database. GPS trackers fall into three categories:

1. Data Loggers: the GPS in this case logs the position of the object and stores the required information. This information in modern GPS is generally recorded in a memory card or internal flash memory and a USB port. It is a very useful tool in Police investigation cases where the objects (generally vehicles or fleet vehicles) position can be known without going closer to the object.
2. Data Pushers: the GPS in this case sends or pushes the information to an external server, which analyzes the data sent. The procedure followed is fairly simple in which the GPS receiver gets the data sent by the mobile phone (Information generally sent by SMS). Some companies provide this kind of tracker in business environments also. A typical tracking system has both the tracking device along with the software, called Automatic vehicle system.
3. Data Pullers: the data pullers are opposite to the data pushers where the information can be taken or queried as long the user wants to. This is based on the pull technology.