| 摘要 |
A portable GPS device and portal for communicating with the GPS device and methods of use thereof are described. A method of tracking movement of a portable GPS device using a geofence comprises: initializing a geofence, the geofence specifying a geographic boundary; storing parameters of the geofence in a portable GPS device; sending a notification message from the portable GPS device to a remote location in response to the portable GPS device determining that it has crossed the boundary. |
