Basically the address displayed there is pulled in real-time from the 911 service that we use. It's not cached locally at all, so the address showing is real-time.

If you update the address and it shows up there, that's the address that would be used if you called 911 right then.

Currently there is no limit for the number of Previously Used addresses. We need to add functionality to remove them. Right now it's basically a "complete history".