A device tracking location adherence and route adherence technology, is disclosed that at least provides a tracked device receiving, a set of coordinates associated with a boundary area, and obtaining a position of the tracked device. Based upon the received coordinates and the detected position of the...http://www.google.com.tw/patents/US20050159883?utm_source=gb-gplus-share專利 US20050159883 - Method and system for tracked device location and route adherence via geofencing
