| 摘要 |
A navigation system for portable communications devices may comprise computer programs for providing a geographical context for display in the portable device. The portable device periodically interacts with at least one of a telecommunications network and a GPS network to update an information portal with current location information. The navigation system includes displaying information on the portable communications device representative of a change in location of the mobile telephone device or a change in location of another tracked device. The information representative of the change in location can be overlaid on the geographical context and both displayed in the mobile telephone device. The combined geographical context and specific location data is scaled to fit a display on a portable communications device. Other embodiments provide means for obtaining information representative of a location of some object or of another object for display in the mobile telephone device.
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