Yes, because having the latest maps is essential for planning routes and navigation.
This means that route calculation and active route navigation is only possible if the underlying map has been downloaded to the Navigator in advance.
To download a map, please select "Settings > Navigation > Map download" on your Navigator and click on "Select and download maps" - There you can select the desired region and download the maps.
Note: Please ensure you have an Internet connection at this time, as the map data is often several GB in size. You can often select only individual regions or the entire country for download. The map data for the countries such as Japan or Korea is a special case – to use these maps, other map data must be temporarily deactivated.