how to get saved route in windows basecamp to garmin tread?

The best method is to

1. In BaseCamp, export your Waypoints, Tracks & Routes as 3 different Gpx files.

2. Mail the WayPoint and Track Gpx files to yourself.

3. Use your phone to open the above mail and save the Gpx files to your phone.

4. Use the Tread app to import import the WayPoint & Track Gpx files. Best to use different Collections for each.

5. Connect the Tread device to your Computer and copy the Route Gpx file to the GPX folder.

6. On the Tread device, Go to Route Planner and Import the Routes.