After my bad wreck, they tell me I was up and moving around trying to get on my bike. Supposedly I told them I just needed to get home and would be okay. Though actually I have no memory of any of it but just brief fleeting things that don't make sense. I doubt seriously I would have pushed any button on the app to send out an alert. Thankfully the two people that found me realized I'd had a wreck and had a severe concussion. They just happened to be doctors on a afternoon walk.

GPS devices like Garmin Edge already have a built in incident detection that you have to push a button to keep it from sending a alert. And Specialized/S-Works has Angi, that is a device attached to your helmet that also will send out an alert if it detects helmet forces and motions that might be a concussion. Those type things fair much better for getting you help in a actual emergency than relying on you pushing a button. Because after all, when you are knocked silly, as I was, you don't always realize when you need help.

Smart phones have accelerometers in them. So possibly an app can be made to use them to detect such events. Maybe some do. I've not looked since I use Garmin's and Specialized's Angi on my helmet. Otherwise, there is a app already on your phone to send out a emergency message. Actually several. When set up, the emergency contacts can be accessed without having to unlock the phone. You can simply call 911 (112 in Finland?) or any other person significant to you. Or text them.

When I had my wreck I wasn't using a Garmin that had incident detection, nor did I have Angi, but my wife and I had been sharing location through Google Maps for many years. So when she saw that I wasn't changing location on a part of the route that it would be unusual for a stop, she was about to call me when her phone rang and the people that found me were calling her using the emergency contacts on my phone to say a ambulance was on the way and I'd be okay.