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Strictly speaking, GPS devices are passive and don't transmit anything (correlating received signals from a constellation of satellites). Many cellphones use Assisted GPS, sending GPS information to servers to improve positional accuracy (sent through the encrypted data channel). Breaking this encryption is non-trivial (only GSM is known to have a vulnerability). Therefore, it is practically impossible to use a program to externally monitor GPS or AGPS signals. However, many phones offer programs to monitor position on the phone (for example, the iPhone'sMaps application).

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