Heh. I guess I need to learn more about d-bus....

So I think that there are 4 parameters to take into account: physical location, the components of velocity (speed and direction,) and time. This says not only where you are, but where you're going and when you might get there.

I wonder if something like cron would be useful. Offhand I'm not immediately coming up with anything, but I'm guessing someone would find a use for it.