Well that's just it - it's probably supposed to do that. But bugs happen, and a phone could die or break for any number of reasons outside of your control. Peop

Well that's just it - it's probably supposed to do that. But bugs happen, and a phone could die or break for any number of reasons outside of your control. People on the internet trying to explain why some particular failure that you saw shouldn't happen won't be there when you're stuck with no way to navigate, and their arguments won't be of any use. Paper maps are actually immune to most of these failure modes.