During the setup of your timr App you're asked for location permissions.
If you choose "deny" timr will notify you that GPS is disabled when starting a recording.
If you choose "continue without GPS" you can always change the settings later on.
1. Enable/Disable position tracking on your Android Smartphone
To enable the GPS tracking on your smartphone go to your smartphone settings and to "Location".
2. Position Tracking in the timr App
The timr Android App shows the location icon on the top if GPS is active. More information about the Position Tracking in the timr Android App is available here.
2.1. Disable GPS Tracking in timr
You can also disable the GPS Tracking only for timr. Go in your timr App to "Settings", there you have the settings "Position Tracking".