Incident Detection

I fell today at the end of my run. It triggered an incident report. So, it works. 

I haven't fallen during a run, and hope never to. I was out running with GPS on, and all of a sudden stopped and hit the hand with the watch against the other hand with a hard slap. It didn't trigger incident. So Garmin must have put quite a bit of thought into simulating a human tumbling during a run or collapsing suddenly. 

generally you have to take an active 'action' in order trigger the incident. Not just stopping, and usually not just tumbling or rolling on the ground. See below - all the instructions I've seen state the user has to press and hold the power button (top left) and that will do it. I'll also add that I've had the trigger happen to me a couple of times - the arm sleeve I've been wearing evidently presses that top left button and starts the incident process. One last thing - when you DO trigger an incident, that stops your activity (not just pause, but STOPS). So, it's not like you can trigger the incident and keep going on your in-progress workout. Nope. I learned that also. I've since removed that feature from most of my various activities.

Forerunner 645 Music and fēnix 5 Plus Series:

• To activate, hold down the top left button (power button) for approximately 7 seconds until the watch vibrates three times
• This action will discreetly send a message with your real-time location to your preloaded emergency contacts
• Another option is to hold down the top left button for 2 seconds, scroll through the icons and select the Assistance icon

https://www.garmin.com/en-US/blog/featured-2/safety-and-tracking-features/

I have fallen last week while hanging in a tree root. Nothing happened on my FR645M (FW 5.90) despite the feature is enabled. It didn't triggered an incident report and continued the garmin coach workout planned. Maybe the fall wasn't enough violent despite having some bruises and light wounds after that ?

Mine triggered twice last week. Simply riding a bike and turning from pavement dirt seems to be enough. Way too sensitive on biking mode. I have tripped and fallen while running with no incedent detected. 

Just got back from the hospital after a 3 day stay. Broken clavicle (surgery), four broken ribs, and a concussion.  Going 35 mph downhill on a gravel bike, I realized, too late, that I was coming upon a 90 degree turn. Locked up the brakes, but no luck. While lying on the ground unconscious, Garmin notified my emergency contact who came and took me to the hospital (don't worry, the bike survived, as did the dumb-ass rider).  Bottom line, it works, use it.