I recently installed a factory '07 nav. When I start the guidance the system states "Proceed to the highlighted route and guidance will begin". No more is said until I reach the destination, "Destination". I have never used a GM nav, but doesn't it tell you were to turn? I drove Lexus and Acura with nav and they did. Any suggestions?

 

You don't have VSS (Vehicle Speed Sensor) working or not hooked up...... do a search on NAV & VSS & you'll find plenty of info on the subject.

 

https://chevroletforum.com/m_5604/tm.htm

Check this thread and it should answer all of your question..