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I used this adapter to convert my factory antenna for use with an aftermarket radio. It performed perfectly. The only reason I gave it a 4 is because it seems a bit bigger then it needs to be but not such a big deal because once its in the dash you can't see it anyhow.
what kind of special piece do i need for my gps to work in my head unit
You could buy the GPS add on module from JVC if they still sell it. If you have an iPhone 4 or later you can also go into the radio settings and use the iPhone as your video input. If you have an iPhone.....