This GPS has been mounted on the dash of my Explorer for well over a year.  Being my first GPS this one has always been my favorite, but the small  amount of RAM is a bit of a problem for me these days. I typically use the  MAPs from the ROM, but I also have several regions loaded from Garmin's  Roads and Recreation CD--though not as many as I'd actually like. The  features on this unit are great and the screen is very visible. With the  bean bag mount, you can position the screen for the available lighting  without any trouble. If you're thinking of taking this hiking, I would  recommend the eMAP (8 Meg of RAM) or the ETrex Summit (better outdoor  features). For heads up vehicle navigation, the GPS III is the best choice.