fit sat nav e46?

Answer 1

Me, I would buy a portable Nav like a TOM TOM. Then you can use it in any vehicle you have, in your next vehicle when the Bimmer is gone.. .and even loan it out.
Bonus, you can remove it or hide it from thieves!!

I would never buy a built in system for a car or truck ever since I got my portable.

PS Navigon is the #1 software on the market.

Just need to decide do you want a dedicated like TOM TOM or do you want a computer (laptop or palmtop) with a GPS antenna and software?