| 摘要 |
A portable navigation device or navigation system along with a method of operating it and a computer program for controlling it are described. The device or system includes a display, memory, processor, wireless signal receptors, and a user interface. The memory includes one or more map data files having digitized map data and descriptive data identifying features represented within the digitized map data, and the device or system includes software capable of performing navigation between a current location determined from the wireless signals received, and a destination at least partially identified by the user input. The software also includes an address finding facility which when selected, causes display of at least one address portion identifier together with a first sorted list of alphanumeric characters.
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