Tyre to Travel.
Or buy a SatNav where you can download the gpx into a folder called 'GPX2ITN' and the unit converts it to a usable Itinerary file.
Thus:-
Converting a GPX file into an Itinerary
To convert a GPX file into an Itinerary, do the following:
1. Connect your Rider to your computer
2. Place your GPX files in the GPX2ITN folder on your device.
3. Disconnect your device from the computer.
4. Turn your device on.
Each file is then converted into an ITN file. You can convert up to 50 files in one batch.
5. When the conversion has finished you can load your Itinerary. In the Main menu, tap
Itinerary planning, then Options and Load Itinerary.