Traccar Manager is a mobile application to manage GPS tracking devices. It requires a Traccar server instance to work.
By default application is configured to use free demo Traccar service. To manage devices you need to register user on http://demo.traccar.org/.
Traccar (Server) is a free open source server that supports more than 100 different protocols and GPS tracking devices. You can use this application with your own hosted instance of Traccar. For more information visit https://www.traccar.org/.