The Garmin products Use MapSource PC maps. You could use the PC to create the route, load it into your Garmin and get the directions. Most GPSr will store routes which you can turn on or off as needed.
I am in the market for a portable GPS unit. I am an outside sales rep. So I need one that will allow me to enter up to 20 stops so I can plan my route for the day. I don't want to have to enter every stop each time I go to a stop. I want one that I can load up to 20 stops and hit the road. I also want one that that tells you the street name not just turn right/turn left. Can anybody help?