Location Services on your iOS device allow the TomTom app to use cellular, Wi-Fi and Global Positioning System (GPS) networks to determine your location. If Location Services are turned off, the TomTom app will not be able to determine your location or guide you to your destination.
If Locations Services are turned off you see the message Turn On Location Services to Allow TomTom app To Determine Your Location.
To turn Location Services on, do the following:
Tip: You can find Location Services in the iOS Settings menu in the Privacy sub-menu.