One of the most important function of GPS tracking system is the Geofence. Users can set up a boundary fence around the area. While you will always be able to monitor tracker's movements both inside and outside designated geofences, it can be useful for an employer to receive a notification indicating that an employee has left a designated work zone. 

Set a smaller geofences can also be useful, especially if employees make stops for deliveries, pick-ups, or service calls. A small geofence around a destination area allows you to track arrival and departure times, and by extension, time spent at each stop.