Sirius is on my list of requirements for the head unit upgrade I am planning for, so that's good to know. The Garmin Dezi (and other hardware units, probably) looks like pretty much what I'm looking for, but if I have permission to pick nits, I wonder why smartphone navigation apps don't have that potential yet. I guess I can send a feature request to CoPilot.
I balk a little at having to buy yet another device, but in the same breath, I acknowledge the wisdom of having some redundancy. Could be Christmas, Part 2??