Although I didn't start the thread, I do have a TomTom, and had forgotten that could use Basecamp to convert back and forth, so that was a good idea.
I opened the file that you uploaded to Tyre (the TomTom alternative to their own program, which I find to be not very good. Tyre is better, but TomTom have a quirky system, where it predicts the raods that you want to go on between points, rather than following the roads that you wanted to load.
The file looks like it's working, but when you load it to the TomTom, which I've not tried yet, it sometimes goes pear shaped...
I'll let you know what happens.
When I figure out how to upload a picture, I'll share a screenshot from Tyre.
