GPS tracking systems are categorized into two modes: GPS Passive Tracking and GPS Real Time Tracking.
GPS Passive Tracking uses a GPS data logger to record vehicle's trip history and then download the data to your PC for map view. Passive systems are useful for companies or parents who do not have a need to track their vehicles in real-time from any computer, nor do they have requirements for real-time alert notifications for speed or geo-fence violations, and other features that real-time systems offer. The advantages of passive tracking are low cost and no monthly fee. It answers the question: where have my vehicles been?
GPS Real-Time Tracking utilizes cellular wireless networks or satellite communication networks or local RF wireless modems to receive location messages from your vehicles or assets in virtual "real-time". Through mapping software, then the locations are displayed on digital maps. Real-Time GPS tracking answers the question: where are my assets now?