I bought the Volt about 2 mos ago, the first car I have owned with factory nav. So far - give me my Garmin!
Just to test the system, I entered my home address, saved it as the home item. Then I asked the system to guide me home. It gave me weird directions, mostly taking me away from my house. Upon checking I found it could not locate my home - which has existed for 14 years. I finally deleted the address, used the location function in my driveway and saved it to the home. Now it recognizes not only the location but the address and will nav back to my house OK.
Then yesterday I was coming back home, due to interstate traffic I opted to take some unfamiliar back roads home. The system did not like that, kept telling me to u-turn and go back to the interstate. After about 5 instructions to u-turn the voice directions went silent and the USB music functions locked up with the volume fixed. (Maybe the lady got mad at me for ignoring her??? Is there a "wife" mode?)
However, the nav map continued to function fine all the way home. I shut the car down, waited a few minutes and the audio functions were normal, but still had no voice instructions when I asked the nav to take me somewhere else.
I recharged the car overnight, and upon checking today the nav voice is back. Maybe she forgave me for not listening to her!
I think I may keep my Garmin in the glove box just in case . . .
One other strange item: Rather than use my phone as a music source, I loaded about 2k of my absolute favorite songs onto a USB stick and turned the Volt into my own Chevy juke box. Works great, indexed fine, good sound. But - - every so often when I start up it will not recognize the USB and defaults to FM. Sometimes I just have to change the source to USB, and sometimes I have to unplug and reinsert the stick. Usually the USB music resumes from where it was playing when shut off, but occasionally it will re-index before playing. Is there some means to set the USB as the default audio input?
Other than that, I love the car. I have been getting between 43 - 49 miles on a full charge, which I know will take a hit when the Minnesota winter sets in.