Real-Time GPS trackers are GPS tracking systems which continuously transmit information so that users can track their location all the time. Real time GPS tracking systems are highly-sophisticated and require the use of tracking services and GPS tracking software. With real time GPS tracking systems, satellite mapping is used to show the location of the GPS tracking devices.
Passive devices are GPS tracking systems that are used to record information to be retrieved at a later date. For example, a Passive GPS device can be used to track a vehicle , but the information cannot be retrieved from the GPS tracking system until it is manually uploaded to a computer. These are also known as Loggers GPS tracking systems.