So im looking to get nav in my 97 740il but i was was wondering how much it would cost and where to buy everything from. Is there an OEM nav made for it? It didnt come stock with the little 4:3 nav screen, so its just the radio and all.
You can retrofit OEM NAV. It's over $4000 if you want new parts, still looking at $2000-$3000 if you start hunting on e-bay and salvage yards.
There are plenty of posts on this, and several people who have taken on the project. Search for "virgin NAV installation" or "NAV retrofit" on this or the E39 board for more information.
Personally, I would buy a car with factory NAV and upgrade it to an MKIV and 16:9 screen (easy plug'n play upgrades) or buy an aftermarket NAV. Going OEM for the sake of it, unless you really have your heart set on it, is an expensive modification. The older MKIIs are pretty slow, and the MKIII and MKIVs are okay, but are starting to be seen as old technology (maybe even called "inferior" by some) compared to a new Lexus or Toyota NAV system...
Yes and no. In principle it is plug-and-play but you may need to burn a couple of CDs with different OS versions, so that you can downgrade/upgrade to recover full use of all the buttons on the 16:9 screen (some operations are slightly different on the 16:9 screen compared to 4:3 screen).
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