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It should at least be an option. I called 911 about a situation some miles outside of town far from any street names. But I had the exact GPS coordinates and read them off to the dispatcher. To my surprise that dispatcher seemed to have no idea what GPS coordinates were.

Addresses are useless if you don't know them.

I once had to call 911 at a local streetcar station, and since it didn't have an obvious address, being in the middle of a street, I'm trying to identify it by station name, and they had a very hard time of it.

GPS should be expected to be an option given its prevalence, the consideration that the supplement(s) are required to be derived using an electronic device - a telephone does not work without electricity, and the urgency to implement.

> GPS coordinates

* coordinates

There are many methods for determining ones lat and long that do not involve one particular GNSS constellation.

In the vast majority of applications you will get GPS coordinates even when the source is a non-GPS constellation. The WGS84 datum is the lingua franca of coordinate systems and what most systems expect by default if not otherwise specified.