Abstract: A client unit (102) has a client GPS receiver (104) integrated with a two-way-radio transceiver (108) and a client manager (116) for performing server-assisted global position fixes. A server unit (120) is associated with a second two-way-radio transceiver (126) and a server manager (130). The client and server managers (116 and 130) function as communication managers, and each has modules for detecting RF channel traffic, enabling transmitter portions of the transceivers (108 and 126) to transmit satellite data and position information only when there is no traffic on the RF channel.

Abstract: According to the principles of the invention, a client unit (102) comprises a client GPS receiver (104) is integrated with a two-way-radio transceiver (108) and a manager (116) for the purpose of performing server-assisted global position fixes, especially in cases where the location or situation makes unassisted fixes impossible or impractical. A server unit (120) is also provided, associated with a second two-way-radio transceiver (126) and a server manager (130). The first and second managers (116 and 130) function as communication managers, each comprising modules for detecting RF channel traffic, enabling transmitter portions of the transceivers (108 and 126). The system may also provide identification codes that accompany data sent from the client unit to the base station to identify the client unit.