Earthquake, typhoon, flood and the volcanic eruption... the whereabouts of the family is one of the most important information at the time of the natural disaster. However, mobile communications may be regulated under such situation. Emergency application Cocodayo helps users by GPS.
The structure of this application is very simple. At first, users register the people who want to confirm safety at the time of the disaster such as a family or important friend with agreements. Then the application links emergency disaster report and informs current location information of registered people on user's mobile. Users can register to up to four people. It is available as the security measures that are easy at normal times if you have children. The downloading is free(iOS/Android), but unfortunately this is released only in Japan at present.