The map data of LARDIS Navigation are based on the free project "OpenStreetMap" (OSM). Anyone can participate in this project free of charge and edit the raw data using various programs. Thus, for example, changed routings or erroneous data in one's own area of operation are promptly included in an upcoming map update and are consequently correctly available in the navigation.

You can get help on this topic from the OSM community or the OSM wiki.