Tarkan GPS 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 Tarkan service. To manage devices you need to register user on https://plus.tarkan.mobi.
Tarkan (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 Tarkan. For more information visit https://www.tarkan.mobi/.