When do they update it? anyone kno?
It's usually updated at every scan. At every stop there's an arrival scan and a departure scan. That answer your question?
When do they stop? are they're certain points to stop at I'm assuming?
It just depends on the distance between the sender and receiver. The longer the distance, usually the more stops the package makes. Eh, I suppose "stops" isn't really the best word. It's really just being routed. Think of it like taking a plane trip that isn't a non-stop flight. You usually have to switch flights at an airport somewhere in between, correct? Same kind of thing happens with package shipping. A package is scanned as it leave the original sender, when it enters and exits a shipping center, and when it's sent out for delivery.