Go to Google maps
Click Get Directions
Plan your route
Click the Blue Get Directions Box
Go to bottom of directions list and click Save to my maps
Click the dropdown box and click create new map
You will see KML next to a small blue box , click and save to desktop
or other file.
Once you have a .kml file you need find a program to convert this so
your sat nav can read it , i use Tyre to Travel , its free to download
an does a good job.
Just import your route planning from the .kml file and you can save it
direct to your Tom Tom Rider