Got me thinking too. In my 07 hybrid with Navi, the GPS was on the dash. Looking at the CR-Z Navi Manual, also states the GPS is on top of the dash with all the normal warnings of metallic tint, radar detectors etc etc.
I have a new silver ex nav, and had the armrest installed. I ordered the xm for the car but looking at the installation looks like it will cost several hundred dollars. My question is, what should I expect to pay for the installation. Thanks for the help.