A mobile location reporting communication system consists of a network of communication sources and targets managed by one or more control stations. In the system, a communication source may request for the location of a mobile communication target from the network. The target conveys its location to...http://www.google.com.au/patents/US7199726?utm_source=gb-gplus-sharePatent US7199726 - Method and apparatus for locating mobile units tracking another or within a prescribed geographic boundary
