Via SMS: only if you go, answer the SMS with ‘yes’ or any letter. If you don’t go, then we ask you to do anything.
The app: you get two buttons displayed: [I go] and [I’m not going]. We ask you to press one of these two. If you press [I go], you will get more information about the location and the route to the incident. We ask this to make sure not too many volunteers go to the incident.