That's a fair point, assuming you have service it could make it easier to find your specific location in case something happens. However, I'd be much more likely to recommend a GPS beacon specifically designed for this purpose rather than an apple watch. My dad and I used to wear beacons while skiing in the outback in case of an avalanche

I'd also consider trail running. I sometimes run after work. I don't carry alot, and on the trails at sunset I hardly see anyone. I could see myself taking a tumble and needing help. I once encountered a wolf out there and sprinted like never before to get out of the area. I could have easily fell.

Yep. I broke my ankle because I had to get back home quickly and I tripped while descending some boulders. Fortunately I was in mobile coverage and on a trail that a lot of surfers use, so I was able to call an ambulance and had a few surfers stop and help me out.

Yeah, trail runners certainly could take a tumble, also. I see plenty of them and I'm amazed at their ability to avoid injury on all the rocks on the trail.

I carry a PLB--but those can't sense a fall, they only broadcast if you specifically trigger them.

Anyway, you're thinking of an avalanche beacon. Those are to help others you are with find you quickly if you're buried in the snow, they have no GPS capability.