The Dash Express “gives you the most current, locally relevant information by using the power of the Internet, including Yahoo! Local search and other websites you know and trust.” Product page. Video after the break. Click here for first picture in gallery.
When it has a Wi-Fi connection, the Dash searches for larger downloads, such as maps. When it has a cellular GPRS connection, the Dash gets traffic feeds and sends traffic reports back to the service (which Dash calls TruTraffic). The result is almost instantaneous