My older Toyota has a DVD for its maps and works without any comms — I use it all the time (and even pay to update the maps from OEM every few years).

I would LOVE to be able to use my modern Toyota's navigation system; unfortunately, this requires you to connect a modern cell phone (cannot use without it) which I don't own.

So for my new vehicle I instead purchased a stand-alone GPS unit ($60) which comes with lifetime map updates.