Yes, you can do geofencing on your own without the help of a third-party provider. All you need is a GPS-enabled device and an app that supports geofencing. Many popular apps like Google Maps and Apple Maps already have geofencing capabilities built-in. To create a geofence, simply create a new location in the app and specify the radius you want the fence to encompass. Once the fence is created, the app will automatically notify you when you enter or leave the geofenced area.