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Lately I've seen a few threads of people asking what a navigation unit looks like installed in a 3ES, how it's done, what it cost etc. I had a thread for my install years ago, but the pictures are gone. I did this back in the summer of 2010 using a Pioneer Avic X710BT. At the time navigation systems had only been around for about a decade and were still limited to higher end luxury cars; bluetooth phone call capability was much newer with bluetooth audio was the latest. I think I spent about $600 total on this (the unit was the previous year's model so I got it on sale for like $500), today I'm sure it would be a fraction of that using a used headunit. After nearly 8yrs it still works well and provides navigation, bluetooth phone calls (no audio), SD card and USB audio playback with a good interface, and a backup camera.