Monte SS factory navigation retrofit?
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The corvettes have the Bose amplifier with the NAV unit, we have the Monsoon amplifier with the same NAV unit.
I was the one who posted the "How-To" and have done the coversion myself. I can tell you that it costs a lot more then $500 to get a decent aftermarket in-dash Nav system. Most new HUs start at around $600, you'll spend another $50 or so in a mounting kit and harness adapter, PLUS, it's another $150 or $200 if you want to retain SWC and OnStar, as well as your turn-signal chimes, etc.
My car came with Bose, and I payed $485 for the Nav unit that came with the map disc and antenna, spent another $25 for the VSS harness (admittedly no longer available through JP Customs), and spent another $50 on dealer TechII programming. So, for under $600, I have a factory system that may lack a few features of aftermarket HUs, but works flawlessly with the factory accessories and is less of a theft target.
It's also never given me a wrong a turn, and voice guidance chick sounds kinda hot (though my wife may disagree!).
hahaha That's hilarious. 
It's pretty easy to make your own VSS wire, since the company that sold them for $25 went under.
