When planning routes with your phone/tablet, that is, when using your Android or iOS NUVIZ app to plan routes, you are using online maps. Therefore, when planning routes, you need a WLAN or cellular data connection for your phone.
NUVIZ device, however, uses offline maps only. They are stored in the internal memory of your NUVIZ. This is why you need to use your Android or iOS NUVIZ app to download the needed offline maps to your NUVIZ before your first route navigation. There are no preloaded offline maps in your NUVIZ at the time of purchase