Hi, I use an application called Tyre - free to download on your PC. It uses Google maps, and you can click & drag the route you actually want to take - just make sure that you place enough waypoints on your intended route. I have found it very easy to use, and when your route is finished, simply 'save as' and then save the route for the Sat nav that you are using. I have used it for both TomTom and my Garmin sat nav, without any problems.