Buttons 2 Introduction LIGHT CTRL Press to turn the backlight on and off. Press to turn the device on. Hold to view the controls menu. GPS Press to view the activity list and start or stop an activity. Press to choose an option in a menu. Hold to view GPS coordinates and save your location. BACK SET Press to return to the previous screen. Hold to view the clock menu. DOWN ABC Press to scroll through the widget loop and menus. Hold to view the altimeter, barometer, and compass (ABC) screen. UP MENU Press to scroll through the widget loop and menus. Hold to view the menu.