Randy,
You and I are in the same situation. I traded between S&T and SA regularly and finally settled in with SA because it was the last one on sale.
Google Maps can layout a path, but as it web app, changes underway require that you find wire (old term for getting internet access). For us this was a complete stopper until we put a repeater in the coach and even then, if there is no signal, there is nothing to work with....
They say that you can down load the charts (maps) in advance, but that assumes that you know where you are going and we often are not at all sure. GM also will not follow your onboard GPS. This makes it more or less useless as an enroute navigator.
I really liked the way it could be updated enroute, and when you stopped for fuel or the overnight at a different than planned time, the change would wrinkle trough the entire plan.
Someone told me that CoPilot can do most of this, but I have not had the time to learn enough of it to say that for a fact.
Matt
Matt & Mary Colie
A sailor, his bride and their black dogs (one dear dog is waiting for us at the bridge) going to see some dry places that have Geocaches in a coach made the year we married.