It's that simple:
- Enter your destination via "Navigation > Address input".
- Click on "GO" at the bottom right to calculate the route.
- Add intermediate destinations / waypoints as required.
- Save the route by clicking on the "Save" icon
at the top right, name the route accordingly and confirm your selection.
- You can now cancel the route guidance and select the route you have just created via Start route in the navigation under "My destinations > Routes".
- Click on "Export GPX" in the top right-hand corner to export the route as a file.