This talk shows how to make multiple clients, including users and IoT Devices, real-time update GoogleMap Application. What do you want to imagine with multiple clients real-time updating GoogleMap Application? In this talk, the features of it are as follows: Display and monitor IoT devices like drones on a map. Checking members’ positions concurrently with navigation when moving in a group. Such applications require real-time user experiences, but their implementation tends to be very complicated. However, it can be easily implemented by using Phoenix’s Pubsub, Presence, and LiveView. LiveView provides a rich real-time user experience. PubSub provides a simple Realtime Publisher / Subscriber Service. In addition, Presence realizes Tracking to Processes and Channels. By using them, you can monitor the activity of multiple devices and update their location information in real-time on GoogleMap. Also, show some client implementations.