The stereo and navigation system inside the Lincoln Navigator features clear markings, a mix of buttons and touch screen features, and decent graphics resolution. It's easy to zoom in and out on the map, but a little more difficult to choose and save station pre-sets. Programming is easy using the alphabetical touch keyboard, and there's even a breadcrumbing feature so that you can backtrack if you get lost. The screen isn't a smudge-free surface like in a Lexus, and it's too small for a big truck like this. The only knob is the one controlling volume, and since we like knobs this isn't a preferable arrangement.