Just try it.
Don't get confused by the lower number "4" in the name.
34xx is the new model with new firmware capabilities like new version TrafficTrends 3D, FastRouting, InstaSearch, mp3 player, video player, Smartphone Link (with Weather, Live Traffic, Live Cameras, Fuel Prices, Tracker) and if you own a 3760 you can now enable 3D Terrain and Buildings and ASR Voice Command.
Lot of nice features, you also should find Garmin Guidance 3.0 info
Instead of 7.10 GCD, can I use the latest 7.80 GCD for this process?
34xx is a newer device, one generation ahead of 37xx. It is upgrade. It's like you swap old and abandoned 37xx in favor of new device, which gets full support from Garmin
When I choose another point while routing I have two options:
1) start new route
2) add to existing route
and I can choose even a third point and I can even rearrange their position as first, second and third.
When I select English Text the availiable options are:
No Via option here!!!!
Garmin Lost in Translation ???????