Other

The TomTom Iphone will be better than a 3Gs GPS.

The TomTom Iphone Dock House will also contain a dedicated loud speaker in it's mount which can shout out directions over the noise of the traffic.

The Iphone will also contain gyroscopes which make it more usable around busy cities or through tunnels where signal might be weak.

Another interesting feature of the dock is that it will also store map data on the dock which allows you to save storage space on the iPhone GPS unit Dock House. However, should you want to use the iPhone as a stand alone GPS device then maps are available to download direct to the iPhone.