“An Italian website is offering suggestions for using the iPhone with car-based GPS units, specifically TomTom’s x10 series,” MacNN reports.
“The iPhone has no internal navigation support; when connected to a device like the TomTom 910, the most that can be done is a live reading of directions. The best use of a TomTom may therefore be calling functions, since by pairing with an iPhone via Bluetooth, it can then sync with Address Book contacts. This allows the unit to quickly make calls through a readily-available list. To turn a GPS unit into a speakerphone, meanwhile, users can select the appropriate audio output on the iPhone,” MacNN reports.
More info and links in the full article here.