Setting Up Extended Display Mode
You can use your Edge® 520 Plus device as an extended display to view data screens from a compatible Garmin® multisport watch. For example, you can pair a compatible Forerunner® device to display its data screens on your Edge device during a triathlon.
After pairing your compatible Garmin watch with your Edge device, they connect automatically the next time you use Extended Display mode.
Parent Topic: Customizing Your Device