Google is taking a shortcut in navigatin, especially in US, where it is relying on its own maps, own user data etc, eclipsing the Teleatlas etc of this world. The following youtube trailer is explaining some of this:
Identifying people, objects and data by their geographical location has always been crucial, though it has provided limited commercial value. However, the rapid evolution and commoditisation of the communication services technologies has led the way to the development of this activity as a business opportunity. One way to identify the data and objects by their physical location is by geotagging them - the process of adding geographical identification metadata to various media such as photographs, video, websites, RDF or RSS feeds and is a form of geospatial metadata.