Changing system settings
1.Press the SETUP button on the GPS. The screen will display a menu, as shown below:
2.In the menu, tap one of the six submenus:
o Tap 
to adjust the volume.
o Tap 
to adjust brightness.
oTap 
to adjust the contrast.
oTap 
to set the touch screen sound on or off.
oTap 
to set the FM transmitter frequency.
oTap 
to set the screen aspect ratio. (not available in GPS mode)
3.Turn the knob to adjust the selected setting. The menu turns off automatically after several seconds.
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