Aftermarket GPS on a 2005 9-3

[dave08]

Hello.
I have already seen some photos on the web of a 9-3 pre 2007 using an aftermarket gps.
The latest thing was this: http://www.youtube.com/watch?v=QJkVxsn2Uz4  and android system displayed on the ICM3.
As any of you installed another GPS? If so, could you please describe the steps, or at least tell the brand and model and if it was necessary any marry/divorce with tech2?
Thanks and regards.
David