| 摘要 |
A system for monitoring objects and individuals. The system includes a first tracking device and a monitoring station to track location information. A user interface provides to remotely access the monitoring station. The user interface includes a graphical rendering to select a series of keystrokes. The graphical rendering prevents unauthorized recording of the series of keystrokes. A first request signal communicated obtains location coordinates of a first tracking device. The first tracking device transmits a first reply signal that comprises a first identification code. A second tracking device receives the first reply signal, compares the first identification code to a stored identification code and communicates to the monitoring station a second reply signal that comprises the location coordinates of the first tracking device.
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