| 摘要 |
A portable electronic device includes a GPS receiver, a display and circuitry. The circuitry is configured to determine and update a position of the electronic device from data obtained by the GPS receiver as the electronic device moves. The circuitry is also configured to provide a series of navigational alerts as the electronic device moves to a user specified destination, and effect at least one of turning on or turning off the display in response to recognizing a predetermined condition relating to position or movement of the electronic device. |
