I would like to have a mobile app which is free, or low-cost and has features like:

- You should register as a user
- If you face problems on road, you could just press a button, which will create an alert
- The alert is also shown on the map
- Other users nearby will receive an alert that fellow cyclist is in trouble and they may react
- You could configure the distance within you'll get the alerts
- Users' locations are not shown on the map, only the alert location

There are lots of this kind of apps, but they all are based on the contacts on your phone. Whatsapp location sharing is quite close, but anyway someone has to manage the group. And there is no possibility to filter the messages. We are trying to get something like this in use in Finland, so far no good options found.

Anyone has any suggestions?