Hello it is impossible to switch from USA to Europe Navigation, the only way is to change whole head unit. Have in mind that Europe head unit is equipped with immobilizer, and you have to decode it before putting it in the car (virginize it). Also there are two types of head units - with one rear camera, and with three cameras (3d vision). I have for sale three NAV units - 2 with one camera, and one with 3d view. All tested working with warranty. If anyone is interested PM me.