I'm happy to pitch in some info about fitting the VDO Dayton MS5200HD nav system.
I believe this is the dealer fit option, it has a remote and IR sensor, and uses SD cards instead of map DVDs.
It comes with a loom from the nav system's video connector which plugs in to the video socket on the side of the VE's headunit, and an interface box containing a microcontroller that connects to switched 12v, ground, and splices into a GMLAN wire - this enables the RGB input and nav button on the headunit, as well as the nav time and nav audio options in the menu, neither of which do anything as the interface box doesn't connect to the nav system at all.
It comes with a stand alone speaker (think mobile phone hands-free kit speaker), but if you've disconnected the factory centre speaker for better sound, it could be wired up to that instead for neatness.
I personally used the nav's mute line to switch a relay which cuts the driver's door speaker over to the nav system when it wants to speak.
I got my system secondhand on eBay for $300 (though they're available new for about $900) and have updated the maps twice (2007 > 2010 > 2013) using BMW High system maps - As far as I can tell, anything that uses the Philips carindb format works with this system. Whereis still sells map SD cards to suit for $190 each as this is the same nav system currently used in the high end FG Falcon models, only they have some modifications to work with SUNA live traffic updates.
After a firmware update, it hasn't missed a beat in several months.
Pics:
Nav unit under the passenger seat.*
The card slot end.*
Start up screen.
Main menu.
Map screen in 3D mode - Street names blurred to protect the innocent.
The GPS antenna is mounted under the rear parcel shelf, sticking up through one of the square holes in the metal parcel shelf frame.
Owners manual is
here, and the quick start and installation manual is
here.
*
My unit is mounted upside down on a couple of custom brackets because I'm fussy about levelling it to get the best performance out of it's internal gyroscope. I suspect it'd work just as well plonked down on the floor at an angle though.
)