I've also have a 760 and have had no problems with it until today......when it routed me into a very small parking lot for a water park in Dodge City, Ks. Grrrrr......the road used to exist but a building now stands there. Luckily I could circle around the lot and get out the way I came in, using the entrance as the exit was too tight a turn. What fun!
Typically I use Basecamp to plan and review my route on the 760. But unfortunately as of late my laptop won't recognize the gps. I also like to review each route using google maps satellite views. And if I would have done this I wouldn't have ended up in parking lot.