For iOS 6 you need version 1.12 or higher of the TomTom Navigation app.
The TomTom Navigation app is compatible with the following GPS enabled devices
The Navigation app also works on the following devices that have NO internal GPS. These devices require an external GPS accessory in order to be used for navigation.
Note: The following older iOS devices are no longer compatible with the latest version of TomTom Navigation app:
Do not delete the compatible app version from your older device. You can continue to use the app.