This is a property (land) surveying tool for personal use (app is not intended for professional use).
Set the geolocation (GPS) coordinates of the area boundary that you're interested in (fence area), either by adding them manually or by importing them, then the app will check if the current location coordinates are within that boundary. For example, this app will be useful if you want to check if you are walking within your property's boundaries and are on your land and not your neighbours'. The app takes your current location (requires permission), then displays your current position on the map and then shows you if you are within the marked boundary. The boundary area colour will change from red to green if your current location moved to within the fenced area. The fenced boundary is yellow if no current location tracking is enabled.

New feature added in v1.0.0: track and save (record) your GPS coordinates as you walk around your property to create a property boundary line map or map other land features such as a driveway or road access.