The 高知市津波SOSアプリ, developed by Kochi City, is a crucial tool designed for the residents of Kochi City to locate and communicate emergency evacuation sites during disasters. With just a tap, users can access nearby emergency evacuation locations and send rescue requests (SOS messages) directly to the Kochi City Disaster Response Headquarters. SOS messages received by the headquarters are utilized for rescue operations. Even in scenarios where mobile networks or the internet are unavailable, the "スマホdeリレー" technology enables the transmission of SOS messages to the headquarters.

During regular situations, users can also view nearby emergency evacuation sites designated by Kochi City for tsunami disasters, such as high ground and tsunami refuge buildings. It is important to note that these evacuation sites do not have provisions for long-term shelter, so rescue assistance is essential in case of isolation due to flooding or other emergencies.

The 高知市津波SOSアプリ encourages a sense of community support by allowing individuals to act as relay points during disasters, even if they do not send messages themselves. By launching the app on their smartphones, users can assist those around them. However, this feature may lead to some battery consumption. The app aims to foster a spirit of mutual assistance among users and become a beacon of safety and reassurance for as many people as possible.