I have one of these units sitting in front of me. I am anxious to mount this unit on my bike as it seems very high quality and the large screen size is wonderful. However, the included base map is...uh...lacking in detail. It seems that it only shows interstate highways and some major state highways. This is NOT acceptable for dual sport use, so I am looking for other base maps to purchase for this unit or software that will create base maps. Thanks for the help!