Nextar W3G - W3G LCD Color Touch Screen Portable GPS/MP3 Instruction Manual page 16

General Setup
Screen
Tap in the settings menu to enter Screen menu for calibrating the sensitivity of the
unit, the screen will display as below:
Tap the center of "+" as it moves around the screen. If you touch the center of "+" every
time, it will disappear and tap the screen to return to the settings menu.
Note: If "+" doesn't disappear, you should calibrate again.
Volume
Tap in the settings menu to enter Volume settings menu for volume adjusting, as
shown below:
Tap the buttons to adjust the volume. Then tap to confirm or tap
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to cancel.