I also have a problem with the Nav taking 15-20 minutes on average to lock a GPS signal after parking in a parking garage (once it took 35 min). This is a huge issue for me because I park in one both at home and work. My daily commute through through the city is now almost completely without a working Nav system to help me choose the best routes around traffic. This is my fourth car with a Nav system--I've owned them since 2005 and have had several handhelds too---and I've never had this issue or any other problems for that matter. I thought GPS with moving map was fairly mature technology. I can't believe Ford screwed this up---What gives? I love the C-Max generally, but a reliably working Nav is very important to me and I'm quite disappointed that I didn't get what I paid for. This plus all the other minor glitches with SYNC and MFT are making me really regret my purchase. Does anyone know if Ford is aware of this particular GPS issue, and if so, is there a fix in the works? Thanks very much.