Patent ID: 8644794

Claim:
A method of broadcasting a locator signal from a computer device that includes a transceiver comprising: periodically switching the computer device from a low power mode to a normal power mode after a waiting period and while the computer device is in the normal power mode: receiving, using the transceiver, cellular site broadcasts from a first set of cellular sites within a broadcast range of the transceiver; storing, in a memory of the computer device, data identifying the first set of cellular sites that is retrieved from the cellular site broadcasts of the first set of cellular sites; determining, using the computer device, whether the identifying data of the first set of cellular sites matches identifying data of a second set of cellular sites stored in the memory, wherein identifying data of the second set of cellular sites was received in a normal power mode period; and broadcasting, using the transceiver, an identifier of the transceiver if the identifying data of the first set of cellular sites matches the identifying data of the second set of cellular sites.