INE-Z928HD Problem
 

Hoping I can get some help. I was out of town for 6 weeks over the holidays. When I returned the battery on my 911 was very weak but had enough to start the car. I didn't notice right away but the radio, which always starts at startup, was not playing and only came on after driving for a few minutes. Got back to my garage and put a battery tender on the car and the battery came back to normal. The radio has been starting like normal. A couple of days ago I looked down to notice the clock was way off. The clock is set by the navigation unit. When I pushed the navigation button all I get is the horn sound that indicates a prohibited entry. I went into settings to see if I could resolve and found that the unit seems to have lost all knowledge that it has a navigation option. The audio, phone and AUX settings are all present but navigation has disappeared. It is not just the maps missing, the entire function has disappeared. Any ideas on how to reset/recover the unit? Thanks.