BMW ConnectedDrive-Assist,Drive-Online and Navigation System

[mailmanus]

Hi all, first post from a lurker so please be gentle ( or I'll creep back to my hole )

I'm looking to purchase a 2009 (59) 520d without the above (according to the listing) and I was wondering as the screen is already there, if the BMW Connected Drive-Assist, Drive-Online and Navigation System can be added later either via BMW or other sources.
I've had a general search but I'm not finding anything so any help would be appreciated

[BEEMER69]

would be more cost effective to get one with it in the first place. Can be retrofitted but you're talking big bucks, around 2k plus.

[bennyboydurham]

The NAV equipped ones have a wider screen iirc. It's doable but hellishly expensive and a lot of hassle as the poster above says. Almost certainly cheaper and easier to find a car with nav. It's not like there aren't plenty of 520d's about.