I have the thx navigation in my 04 ls. Does anybody know what locks the nav so you cant use it past 5 mph? Is it the computer or the way its wired. I wanted to buy a video interface to watch movies and one of them unlocks the nav but its 400 i found one for 260 and i emailed the website asking if it unlocked it, they said depending on who installs it. I dont know if they had no clue of what they were talking about or ment to say that if whoever installs it re wires the lock funtion then it can be unlocked. It suks being on the road and not even your passenger being able to use it so you have to stop to punch addresses in.