Hi im a new Civic owner loving the car so far. The last owner obviously did not go with the ootional extra for the sat nav head unit. My question is if i buy a Honda Civic head unit that does have the sat nav is the wiring for it already there in the car? Will i just need the gps antenna? Or is it more complicated. I have phoned Vertu Honda parts and he was unsure if the wiring for the sat nav would be in place. Your help would be appreciated with this.