If your vehicle never had navigation in it is not as simple as just installing this unit, please do your own research regarding installation. RARE AND HARD TO FIND RADIO!! The item "2003-07 GM GMC CHEVY OEM Factory RDS Stereo AMFM Radio 6 Disc Changer CD Player" is in sale since Sunday, February 24, 2019. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Interior\Other".The seller is "29cora" and is located in Orlando, Florida. This item can be shipped worldwide.