Answers: I hold a 2004 R32 with matching setup that your jetta has for the radio and i get tired of it also so went and bought a 7 inch touch peak cd/dvd/nav/sat radio made by kenwood. I paid approaching 900 bucks for just the person in charge unit but also bought the stuff to hook up the nav and sit radio which cost me an extra 1200 but well worth it. I never return with lost with the nav and other have my fav music next to the sat radio. check out this site it might minister to...good luck
http://www.kenwoodusa.com/Car_Entertainm...
you can any get a factory nav component from VW or a double din after market nav part. the link have an aftermarket system you can have put within its a pioneer avic.
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