chick on the navigation button, but can't enter?
if it is a new dvd gps, you can try to re-pug the SD card.
if it doesn't work still, you need to re-set the navigation path. setting method as follows:
starting up - see the three-dimensional interface - and then flip the three-dimensional interface, and see the page music backlighted, click to enter - see two rows of buttons - click on the navigation path - enter it. click on the white ares behind the middle rectangular box. - when enter it, you will find several folders, double-click the the DSA folder - and then double-click the question mark DSA.EXE. when double-click it, it will return to the previous interface, then save it. The Save button is on the left of the upper right corner. After saving, you can enter into navigation.