Well, to be fair, dmd2 is primarily  “follow prepared GPX” app for off roading, with some damn cool features in that department & more (roadbook, obd…). Having navigation capabilities is pretty useful add-on, which makes this app even more cool, but there are many, so many 🙂 , better apps if you only need plain on-road navigation… DMD works with them (for instance, as a launcher), not compete with them.