GPSMAP 3006C/3010C Owner’s Manual 61M AIN MENU > SYSTEM TABSystem TabThe System tab consists of five sub tabs:General, Units, Time, Comm, andUpdate.General Sub TabUse the General sub tab to control system settings for system mode, speed filter,automatic backlight, beeper, language, simulator controls, restore factory defaultsettings, and to view the software version.The following settings and options are available:• System Mode—select Normal (normal navigation) or Simulator (forpractice only). For more information about Simulator Mode, see “SimulatorMode” on page 8.• Speed Filter—averages speed readings. Select Off, Auto (automaticallycontrols filtering), or On (allows you to enter a value from1 to 255 seconds).• Automatic Backlight—automatically adjusts the display brightness to aspecified level at sunrise and sunset. You can specify offset minutes forbefore sunrise and after sunset.• Beeper—controls the audible beep. Select Off, Alarms Only (sounds foralarms/messages), or Key and Alarm (sounds for key presses andalarms/messages).• Language—sets the language for the unit’s on-screen text.• Services—after a new device is detected on the network, clearing theAuto-Detect Services check box speeds up the startup sequence. If theAuto-Detect Services check box is not selected and new hardware isadded, you must select the corresponding service check box to enable thenew hardware device.The following soft keys are available:• System Info—shows the unit’s software, basemap version, and electronicserial number.• Update Notes—shows software notes for the current software version.• Factory Dflts—restores all settings to Garmin’s original setup values forall devices on the network.To adjust the automatic backlight settings:1. Highlight the Automatic Backlight field, and press ENTER.2. Using the ROCKER, highlight On, and press ENTER.3. Highlight the Setup button, and press ENTER to open the Adjust Backlightwindow.4. To adjust the backlight levels For Day and For Night, highlight thecorresponding slider, and press ENTER.