To remove the nav unit, you need to:
1. remove trim over glove box
2. remove trim over head unit
3. remove 2 screws over head unit/ac vents
4. remove AC vents over radio
5. open head unit (eject button). Put something under as a prop to keep it open when it tries to autoclose. 2 tabs on the bottom behind the face hold the unit in.
6. with the help of a light and a thin pick, push each tab towards the inside of the radio while gently pulling the unit out (if you move the tab right, the unit will easily slide out on each side).