Have a 2012 RDX Tech. On a recent trip to New Brunswick, Canada, I discovered that this area (at least for the most part) is not covered. One cannot select a destination to NB from the US but once there, a few of the larger cities seem to be accessible from the nav system. One interesting thing I noted is that once you are off grid, the system leaves 'bread crumbs' along the path you have driven.

I suppose one has to buy a separate disc for these areas?

 

Now that's a road trip!