retrofitting the OEM nav has been discussed extensively, and for the most part is vastly too expensive for what you're getting. I believe it's at least $2,000 for just the parts (if you're lucky) and it requires replacing the entire dash wiring harness.
I wasnt that impressed with the stock Nav Unit when i took it out for a test spin before i bought my Speed3. Granted, you get a bigger screen than you would with a Garmin Nuvi or whatever. If you want a big screen, get the Pioneer unit with Navigation for your head unit.. but that still costs around $2000 and isnt that good of a head unit musically speaking... if all you want is a unit for video and nav, then its a good unit, if you want it for music.. forget it.. the specs on it suck.
just get a garmin nuvi and then you can take it with you since it has a rechargable battery, plus they have that FM transmitter to get real time traffic updates if thats something that is of interest to you at all
For $2000, you can almost pay little over half that and have everything you would want.... navigation, pc, music, video, dvd all by using a carputer, the japanparts.com dash housing, and a 7 or 8" vga touchscreen monitor. The indash nav, although neat, seems very limited and useless. The streetdeck software is much more promising.
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