I had a friend killed in a hit and run, she was found nearly a week later by family members searching possible ways she could have used to walk home from work, had she had something like this (and it had not been destroyed) they could have had closure much faster.

My mother's father, while still alive, rapidly deteriorated mentally and was in two accidents by himself in somewhat remote areas and also went to drive to the VA 15 minutes away and ended up several hours away lost and confused when state police came upon him.

My half-brother was driving a box truck for work when it went off road (ice) and into a very steep ditch, the truck was not visible from the road and was unconscious for some amount of time, fortunately this was still in flip phone days so his phone was in his pants pocket and within reach. Even on the phone with 911 he said he saw the emergency vehicles pass him (via their lights) while he was on the phone with 911.

2 or 3 years ago, the brother of the girl that was killed in the hit and run, hit a patch of ice on an on or off ramp and rolled his car multiple times down the hill with his pregnant girlfriend in the car, with the car landing on it's roof. Fortunately it happened during day and there were people there that witnessed it and while quite confused/disoriented they both remained conscious, had that happened at night such a device could have summoned help.

I'm one person and these are just the instances I know of where such a technology could have been useful.

A lot of people on HN live in big cities, ride bicycles or public transportation to work, are rarely if ever out of sight of multiple human beings. That's not always the case. Technology like this is great, and the more awareness it gets the more it will be adopted, the more it is adopted the more lives it can potentially save and the more data it can provide on how to refined.

What if someone is home alone and falls down the stairs? Has a heart attack? Is cleaning gutters and falls? My father's father was cleaning his windows, fell and hit his head on the driveway but his wife heard the ladder fall with him and was able to call 911, but what if that was a widower at 2pm on a weekday and he just had to lay there until someone happened to drive by, what if he was in the back yard and had a privacy fence?

The late Grant Thompson crashed his aircraft this summer (I believe they said died on impact) and was able to be located by comparable technology and by knowing where he'd be flying. Had he not died on impact, something like this could have saved his life or had he not told everyone where he was going and when he expected to return this could have given a location to go search (assuming he had signal) and led to a quick recovery of his body.

Edit: and actually, this may have saved my own life if I'd had the technology and it had triggered from a fall from bed. Some years ago I had a hypokalemic event where I was effectively paralyzed, with great effort I managed to get to the edge of the bed and proceeded to fall out of bed like a sack of bricks onto the floor, barely able to move my hands with minimal manual dexterity and poor coordination, fortunately my mother was already living with me due to her health but I still laid there on the floor, with only a bathroom between our rooms, yelling for help for probably 5 minutes. That was a pretty interesting experience, I've written about it here -> https://www.ryanmercer.com/ryansthoughts/2013/2/19/flashback...

Now I wonder if you can go "hey Google, call 911" to a Google home.