While it is not necessary to have WiFi to use the Tractive GPS, setting up a Power Saving Zone for your tracker will significantly boost its battery life.
This works by connecting your tracker to a trusted WiFi network, such as at your home or workplace. As long as your tracker detects this WiFi signal, it will know your buddy is safe and sound.
You can set up a Power Saving Zone directly in the app under Profile > Tracker > Power Saving Zones. Once set up, your tracker will automatically go into Power Saving Mode when it detects it is near that WiFi source and it will show you the location of your WiFi. Once your pet leaves the area of the Power Saving Zone, the tracker will begin reporting GPS positions as normal again.
See more about Power Saving Zones here.