The XL7 benefits from GM’s navigation system, which is good news. It’s straightforward and intuitive, and the buttons and knobs, while small, are clearly labeled. We don’t like how the navigation screen shuts off with the radio, but aside from that it’s a good arrangement which sticks to the jobs of navigating and providing audio. Sound quality is pretty good from the seven speakers, but you need to really turn it up at speed to hear anything because of the ambient noise inside the XL7. The steering wheel boasts redundant controls for volume, preset selection, mode and OnStar.