Garmin Express and Base Camp started failing catastrophically (halt with message including an obscure error code - no hope of restart). I had a go-'round with Garmin over this. Their line was "not us, take your computer to tech for repair." Honest!
I came up with a good fix: run in Win7 compatibility mode. Garmin seems to have realized the problem was really theirs, although the update change history conveniently omits this.
I run two map sets:North America and Europe. Both require some selection of areas. Sorry you get left out, Yukon, anywhere south of the US/Mex. border. In Europe, sorry, UK, Scotland, and Ireland, you've been Brexited. Overall, Germany and the area around it got the nod because that where we drive or might drive. NA goes into the 660 memory and my chunk of Europe goes onto an SD. Download times are acceptable.
I only connect the 660 directly. In general, USB distributors are a problem for anything that's smarter than mice, trackballs, and keyboards.
Base Camp and the 660 are a train wreck for extended routes with shaping points. In Switzerland, I set up a route that began with St. Gotthard Pass.The cool thing about this pass is the original, cobblestone roadway is still open and maintained. I set up a route to pick up "La Tremola" at the bottom of the pass, only a few miles from where I was staying. The 660 ignored the turnoff and sent me up the pass, where I finally got back onto La Tremola. But wait, it gets worse. Coming down the other side of the pass, the 660 wanted to send me up a cow trail (honest!), any number of side roads that included the entrance to an Italian military facility. I'd set the 660 for "ask me" route changes. I spent entirely too much time pushing "NO" and still being sent well of the pre-loaded route. And this was only the first of six days of GPS hell.
While I still have the 660 mounted, it's mostly as a running map where I can change the scale. Maps/Waze are pathetic on this point. For anyone wanting an Android map app that looks for curve-rich riding, check out
Kurviger.
Dip in around 10:00 to see the cobblestone road. It's a little intimidating until it's obvious traction isn't a problem. Unless the road's wet - forget it!