A portable GPS/radio unit communicates over a wireless radio network with at least one other unit which is transmitting radio signals over the network indicative of that unit's location. The GPS/radio unit comprises a GPS receiver for receiving satellite signals from a plurality of satellites, a radio...http://www.google.es/patents/US7456784?utm_source=gb-gplus-sharePatente US7456784 - Combined global positioning system receiver and radio
Combined global positioning system receiver and radio
