If you want to follow a specific route and not one that your system wants you to go, say for example you wanted to visit a location off route whose address is not on the gps you can visit a routing website and save the route you made as a .kml

Transfer the file into a folder called "route", you may have to create this folder.
It would be places at /content / userdata / route


You have to be aware that you can not start the route if your say 50 miles away. You would need to be at the start of the route for it to work.