For real-time tracking via cellular/GPS, Tracker Security offers Locator, a web-based surveillance system. Locator lets you track from one to an unlimited number of persons/items carrying the Tracker Security GTS-100 or GTS-200 on a user friendly map interface.
Users can track the location of targets by three methods:
Continuous Update Using GPRS
GPRS surveillance has a near-real time positioning ability. This option is best when targets are in constant motion.
Location Requests Using SMS
To verify the location of an item, the SMS surveillance feature will map the device's location as frequently or infrequently as needed.
Geo-Fencing
For items and people who should not leave a pre-defined area, the Geo-Fence alarm notifies authorized viewers if and when the tracking device crosses the set barrier.