I found an information from a survey that has been done by GM Fleet. Its about correspondence 1,000 women in making 10 wish list devices to complete their next car. And finally the result showed, 30% choose a satellite navigation system (GPS navigator) and 17% pick an audio system (iPod/MP3) and the last big wishes 15% for climate control. For the rest options, most woman choose sliding roofs and many others. Based on that survey, it showed GPS is becoming an important device to complete your next car.