The navigation function cannot be selected when the GPS module is not connected to the car stereo. To resolve this, make sure that the GPS module is properly connected to the USB port of the main unit. Then, tap Navigation again. If the issue is still not resolved, service may be required.
For all Sony products (EXCEPT VAIO computers): To send your product to a Sony facility to be repaired or to check the status of the a repair, visit our eService web site.
For VAIO Computer products: Please call 1-888-4SONYPC (476-6972) for service information for your product. To check the status of your VAIO product repair, have your phone number or Best Buy service number available and call 1-800-433-5778.
NOTE: Refer to the manual supplied with the car stereo for model-specific information regarding the model of the GPS module required and how to connect the GPS module. Manuals are posted on your model support page.