Could, but I haven't. I use it as an accurate odometer and speedometer. The stock gauge on the bike is ok for daily use, but it's handy to know how fast you're really going and in real-time how far you've really gone, when the distance has to be somewhat certifiable.
Come to think of it, I don't know that I've ever used it to find my way around. Got it in the first place to mark coordinates for aircraft accident investigation. Only when I stopped doing field work did it occur to me to attach it to the bike. I may plan a route with it, but not generally on the fly. And even the route planning is ballpark. For routing, the SPIII (my personal fav) doesn't autoroute so all you get is the big compass arrow and distance (along with the mapscreen or switch to a screen that looks like a car dash). The Quest will tell you when you've gotten off the plotted and will auto-recalc a new one while you're driving (that's why the Quest is the wife's).
