These miles don't accumulate, however, so you can't roll them over from month to month - it's use it or lose it. That means for ad hoc users - perhaps finding a way out of a local traffic jam - use of the app will be free.
The new app replaces TomTom's previous satnav app and completely changes the fee structure, giving you free navigation, speed cameras and traffic for 50 miles a month, every month.