Stupid BT Question

[Coronach]

First of all, I apparently have one of the two dozen PPC-6800s that has functional BT, at least as far as hands-free car kits goes (DCX Uconnect works flawlessly with my phone). My question is this: if I get a BT GPS unit, will the phone work with both simultaneously, or do I have to pick one or the other? It would be nice to use Uconnect and navigate simultaneously.

Also, does anyone know if window tint affects GPS reception? I'm thinking about just tossing my GPS unit on the rear deck and running a power lead to the fuse block in the trunk. That way the unit is under glass (albeit really tinted glass) but is out of sight and mind.

Thanks,

Mike