A tracking unit for assisting in the recovery of stolen monies or other property includes a housing containing a GPS receiver for receiving GPS signals from overhead satellites, a cellular phone transceiver, a microprocessor, and a battery. Following a theft, the microprocessor activates the cellular phone transceiver to dial the telephone number of a central monitoring station. The microprocessor obtains location data from the GPS receiver and transmits the location data, along with identification information, to the central monitoring station. The tracking unit also includes a separate, conventional RF beacon transmitter for allowing authorities to home-in on the tracking unit within a large building or other structure, either after the GPS signals are lost, or after the location of the tracking unit is localized to a specific building or area.
1. A security pack disguised as a bundle of currency bills for assisting in the recovery of stolen monies, comprising:
a housing simulating the size and weight of a bundled package of currency bills;
a GPS receiver disposed within said housing for determining a location of the security pack;
a cellular telephone transmitter disposed within said housing for selectively transmitting the location of the housing and an identifying code for the housing over a cellular communications network;
a radio frequency (RF) beacon transmitter disposed within said housing for selectively transmitting an RF beacon; and
a controller disposed within said housing and electrically coupled with said GPS receiver, said cellular telephone transmitter, and said radio frequency beacon transmitter, said controller automatically and dynamically controlling the selective transmissions by the cellular telephone transmitter and the RF beacon transmitter in response to signal environment.
2. The security pack recited by claim 1 wherein said security pack includes a power switch for minimizing electrical power drain on said battery until said security pack is handed to a robber.
3. The security pack recited by claim 2 wherein said power switch includes a reed switch responsive to a magnetic field of a keeper plate within a bank teller drawer.
4. The security pack recited by claim 1 wherein said controller causes said cellular telephone transmitter to establish a communications link with a remote location on a periodic basis after such security pack is handed to a robber for transmitting updated location data.
5. The security pack recited by claim 1 including a battery sensor and an audible generator, said battery sensor causing said audible generator to emit warning sounds if said battery has insufficient power remaining to successfully operate the other electrical components of said security pack.
6. The security pack recited by claim 1 wherein said cellular telephone transmitter includes a cellular telephone receiver for receiving signals transmitted from a remote location over a cellular communications network.
7. The security pack recited by claim 6 wherein said controller is responsive to signals received by said cellular telephone receiver from the remote location for modifying the operation of said security pack.