I dont think I have and I dont see anything on realoem about it at the moment.

I dont know what it is, but I would think it can be moved. I'm thinking the best place for the nav would be in the area above the changer. You may be able to relocate that silver box. There is a black trim panel under the load floor right at the foot of the left side door that a lot of people have removed to put audio amps, maybe you could move the silver box thingy there?

__________________
04 X5 3.0i auto
03 X5 4.6is