GPSMAP 640 Owner’s Manual 6Automotive 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 the Power keyRestore—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 the Power key.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 GPSMAP 640.Select automatic to have the GPSMAP 640 set the time based onyour 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.Changing the Map SettingsTouch tools > Settings > Map.Map Detail—adjust the amount of detail shown on the map.Showing more detail can cause the map to redraw slower.Map View—select a map perspective.track up—display the map in two dimensions (2D) with yourdirection of travel at the top.North up—display the map in 2D with North at the top.••
