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Yes it can be done. Yes it has been done by members here on the forum. The readers digest version is that he will need a Nav head unit and antenna. The install of the head unit is fairly straightfoward as I have read. He will need to install the antenna. The factory location is under the center of the dash pad ( near the center speaker grille.) It is a bear to install as the center ductwork for the climate control is there. Others have simply affixed it to the dash in a corner. If the car has a HUD it will integrate with the the wiring harness for the HUD.
Once it is installed it will require a trip to the dealer to have the Nav unit matched to the car and disable the theftlock. It is a simple procedure (probably in and out in 20 minutes) with the Tech II.