66 GPSMAP 620 and GPSMAP 640 Owner’s ManualAutomotive Mode: Advanced ConfigurationBrightness—adjust the backlight brightness level. Reducing thebacklight brightness increases your battery life.tip: You can also adjust the brightness level from any screen bypressing and quickly releasing .Restore—restore the original display settings.Adjusting the VolumeFrom the Menu page, touch Volume. Touch and to adjust thevolume. Touch the box next to Mute to mute all audio.Adjusting the Backlight1. From any screen, press and quickly release .2. Touch and to adjust the backlight.Updating the Time SettingsTouch tools > Settings > time.time Format—select a 12-hour, 24-hour, or UTC time format.Current time—manually set the time on your device. SelectAutomatic to have the GPSMAP 620 or GPSMAP 640 set the timebased on your location.Restore—restore the original time settings.Setting the LanguagesTouch tools > Settings > Language.Voice—change the language for voice prompts.text—change all on-screen text to the selected language. Changingthe text language does not change the language of user-entered dataor map data, such as street names.Keyboard—select the keyboard for your language. You canalso change the keyboard language mode from any keyboard bytouching the Mode button.Restore—restore the original language settings.
