| 摘要 |
A portable electronic device has a user interface having a display and an entertainment system which outputs entertainment media signals to the user interface. A tracking system generates tracking data from signals received from Global Positioning System satellites and a monitoring system processes the tracking data to obtain monitoring data which includes at least position data for the device. A wireless communications system communicating with a cellular network transmits the monitoring data to a control centre and receives map data representative of an area corresponding to the position of the device. A mapping module processes the map data to generate display data for indicating the device position.
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