Question about Garmin GPS Map 65s

Yes, you can load GPX files that you have exported from swisstopo onto your device and then use them for navigation. To do this, you can transfer the GPX file to your device using the Garmin Explore app. The app allows you to send GPX files directly from your smartphone to compatible Garmin outdoor navigation devices such as this one. Alternatively, you can also transfer the file to the device via a computer by connecting it via USB and copying the GPX file to the corresponding folder. You can then select the route on the device and set off.