hello people new on here,so go easy on me.anyway i've owned l.r's and r.r's before,and have just bought my 1st discovery 3,and am really pleased with it.its a 2 year old xs,the only thing is i would have liked sat-nav,does anybody know if they have the wiring loom pre-installed?if not would it be a big job to install it,i've bought the screen and the dvd player already thnx baz