Traccar Client is an app that allows you to use your mobile device as a GPS tracker. It reports location to your own or hosted server with selected time intervals.
By default application is configured to use free Traccar service (address - demo.traccar.org, port - 5055). To see your device on map register on http://demo.traccar.org/ and add your device with identifier.
Traccar (Server) is a free open source server that supports more than 80 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/.
NOTE: Continued use of GPS running in the background can dramatically decrease battery life.