That is definitely a NAV hack switch. I had one of those on my 07 but it never worked
What's even more weird is that is appears to hooked into the NAV/Bluetooth drive. It should be hooked into the radio wiring harness under the multi-switch so you can watch DVDs on the screen with the gear in drive. Maybe it is hooked up properly and that's just where the previous owner ran the switch instead of running it to the center console?