Use Cars GPS for Location

I haven’t placed my order yet. Was just looking at where I can position it in the car. Looks like I will need an extension cable so it doesn’t get in the way of the pedals. With the extension cable I could put it inside part of the dashboard. However, I wonder if GPS will work from inside there? Then it occurred to me, my car has GPS built in for it’s SatNav. Would that data be available via the OBD interface, and if it is, is it used?