My GPS just doesn't work well. I use my portable TomTom, instead. But I wonder if the Jag GPS is faulty: the "destination" option doesn't light up & often when I try to enter info, I get odd results. Should I have the dealer look at it (I have extended warr. but don't know if it covers the GPS) or should I just re-install the CD and hope it clears the problem(s)?