@jonah, thanks for posting. I'm the guy that wrote those PDFs. The #1 thing that suprised me in doing the research is that the standard 911 system as defined by the FCC does not get the caller's coordinates from their cell phone like Uber does.

Now with that said, there are a lot of 911 call centers that use RapidSOS or other add on technology that do get the caller's coordinates directly from the caller's phone.

Of course a person calling 911 has no way to know beforehand whether the 911 call center handling their call will be able to get their coordinates via technology. That is the reason I urge everyone to have some way to use their phone to get their coordinates and the equally important accuracy value. Use a compass app, use FindMeSAR (I am developer) or use something else. I don't care. Instead, the important point is that you use 'something instead of nothing'.