Cheap alternative to high-quality urban maps and certified products like TomTom's. OpenStreetMap are generated by OpenStreetMap community and include thousands roads, paths, POIs, etc. OpenStreetMap's vectorial cartography is known for its precision and the multiple features of the maps.
Authenticity and accuracy of information from OpenStreetMap source is not guaranteed by TwoNav since these maps are directly taken as generated by users. Source of these maps is free, but TwoNav offers them to you in a reduced price in order to compensate the costs of generation, optimization as well as maintenance.