I have the iPhone 4 with IOS 4.2. Latest Navigon app. When I first bought this app 3-4 months ago thw volume seemed perfectly fine. But now no matter what I try the volume is so low I can hardly hear it in the car with the windows closed. So not sure if I am doing something wrong, it's a bug in the app or OS. NOT REAL HAPPY HAVING SPENT $60 AND HAVE SOMETHING THAT BASICALLY ISN'T HELPING AT ALL.