 Here's how to get a GPX Rootmap onto your Garmin watch. Go to the website to download the specific GPX file that you need and open it in the Garmin Connect app. Next, you'll want to select the type of course it is. So for example, hiking or running. And then you can give the Rootmap a name and make it public or private. Click done and save. And then select these three dots in the top right corner of the screen. Tap send to device to send the Rootmap to your watch. Select the watch that you want to use if you have more than one watch. And that is it. The next time that you sync your watch and your phone, the Rootmap will be there ready to use.