Gps

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Mazda CX 7
I'm looking to replace the non-bose factory stereo with one I found on eBay that's just an upgraded factory replacement with GPS and other features. I have two questions I'm HOPING someone will help with:
1)Where to mount the GPS antenna? Can it go on the dash or does it HAVE to be mounted to the roof? If so, where?
2)What's to become of my station/clock display on the dash once the new radio has a 7 inch full color display screen?
 
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