Not sure who does Nav software, its nothing I recognize. Nav is just ok on this unit, not great. Still doesn't directly label streets, and even at the highest mag, doesn't label every street on the screen. Street labels are horizontal only, in a white box, with an arrow pointing to the street. Personally, I really don't like these types of labels. Much, much prefer text oriented in the street direction and overlaid. And just try and force the map view to 2D: good luck with that. Took me about 2 hours to figure it out. You'd think when you touch the screen and bring up the zoom button,