Wireless mobile terminal using sensors for controlling autonomous and assisted GPS modes

A mobile terminal capable of operating in a plurality of position tracking modes comprising:

• a Global Positioning System (GPS) unit capable of receiving GPS signals from a plurality of GPS satellites, wherein the GPS unit is further capable of operating in 1) a device autonomous fix (DAF) mode, 2) a server-computed assisted fix (SCAF) mode, and 3) a device-computed assisted fix (DCAF) mode;
• a network transceiver capable of communicating with at least one terrestrial wireless network;
• a controller capable of controlling the operating mode of the GPS unit, wherein the controller is capable of transitioning the GPS unit between the DAF mode, the SCAF mode, and the DCAF mode;
• and
• at least one sensor associated with the mobile terminal capable of generating an interrupt signal, wherein the controller receives the interrupt signal and in response thereto causes the GPS unit to operate in one of the DAF mode, the SCAF mode, and the DCAF mode.