The IQ has to do with your drive.
I quote:
"TomTom has developed TomTom IQ Maps using the NDS specification.
The TomTom IQ Maps solution automatically detects which parts of the map are most relevant to the driver,
then downloads and installs map changes in the background. The map is always up-to-date over data connection.
So to be correct this has to do with driving from point A to B and updates any part of the map that is needed.
Plus a data connection will be need to get these updates as you drive.
It has to know where you are drive in the first place........