Using the Global Positioning System--a global navigation satellite system developed by the U.S. Department of Defense--GPS tracking devices allow people to determine the precise location of a person, vehicle or other entities anywhere in the world. GPS tracking devices come in many forms, and there are hundreds of models and manufacturers. Some devices are integrated with other types of gadgets such as Palmtops and cellular phones while others are meant to be used primarily as a tracking device.
Hardwired
Hardwired GPS tracking devices are commonly installed in some vehicles and can be part of the vehicle's original equipment. These systems generally use the vehicle's battery for power, with the main unit hidden under the dashboard or hood. Some devices also come with an antenna that is attached to the vehicle.
GPS Loggers
GPS Loggers are devices that record information to be retrieved at a later time. Also known as passive GPS tracking systems, these types of gadgets track the location of a shipment or vehicle in regular intervals. However, the information can only be retrieved if it has been uploaded to a computer. Generally, a GPS data logger is placed in a vehicle and as the vehicle drives around, the GPS logs the data using a flash memory. It creates a detailed report of the vehicle's location at certain times. GPS Loggers can also be used to track the whereabouts of an employee or a teenager, but it can't be used for locating a missing car.
Personal GPS
Personal GPS trackers are small devices that look like beepers or cell phones and are designed to be hand-held or clipped to a belt, bag or clothing. These devices are typically used for security reasons such as tracking the location of a child or a person. GPS trackers can also come with a panic button for alerting the one doing the monitoring, or the authorities, in case of emergency.
Real-Time GPS
As the name implies, real-time GPS tracking systems constantly transmit location information using satellite mapping so that users can track where they are at all times. These devices are more sophisticated than the aforementioned devices and typically require a monthly subscription service and a GPS tracking software. Real-time GPS systems have built-in connections to the Internet so that the user can log on any time and check their location (and previous locations) from anywhere in the world.
Data Pushers
Mainly used for security purposes and even espionage, data pushers send data to a central base at regular intervals with a complete record of location, direction, distance, and speed. They are also commonly used in fleet control for managing trucks and other delivery vehicles.
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