Based on my short experience during test drives the Google Maps data is used for POI searches as well as the primary screen display. Once you select to navigate to a destination it sends that destination information to the Navigon app which runs on the separate Tegra-2 based system in the dashboard. This also leads to another interesting result of this mashup. The Google Maps data is distinctly different than the mapping data in Navigon which leverages Navteq maps. (Navteq ended up being acquired by Nokia in October of 2007). Especially outside of the United States there can be dramatic differences in mapping data accuracy. Just look at the drama this week with Apple Maps and folks in Australia needing police rescue.
So to navigate us we have Google, Garmin/Navigon, and Navteq/Nokia all with some role. Better than a static DVD-based system in any case.






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