To activate the touch screen backlight:
•Press and hold the power button 
until the backlight turns on.
To turn off the touch screen backlight:
•Press and hold the power button 
until the backlight turns off.
Using the SD/MMC slot
NAV 350 has an SD/MMC slot compatible with a range of SD and MMC storage cards that you can use to back up or transfer files and data.
Also, the NAV 350’s GPS navigation system has its core on the Destinator OP program. Using this program requires that users load the digital maps available in the Destinator OP SD card included with the device.
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