Geofencing Explained: All You Need to Know

More and more, apps and services are using our locations to deliver information to us. Triggering alerts, ads, or notifications based on geographic location is known as geofencing. And you’ve likely encountered it at least once today. Most of the time, it’s harmless. It can even be helpful, like when you use a child location app to keep track of your child’s whereabouts. Still, you should always be careful when giving away access to your location. Know who is using that info and for what purpose. For instance, you can enable or disable geolocation on browser to control which websites can access your location data. In this guide to geofencing, you’ll learn what it is, what it’s used for, and — most importantly — how to block it when you don’t want to give your location away. Geofencing uses radio frequency identification (RFID), Wi-Fi, GPS, or cellular data to track when something enters or leaves a geographic area. It then triggers an action when that happens. The virtual boundary defining that area is the “geofence.” The actions that pass through the geofence trigger could be push notifications, text messages, advertisements, or emails. Geofencing is also used to monitor activity in secure areas or disable certain technology. Administrators and app developers draw the virtual boundary when creating their service or mobile app. They then determine which action is triggered when an authorized device enters or exits that boundary. Geofencing has become a regular part of our lives, particularly with businesses trying to promote their products and services. Marketing isn’t all it’s used for, though. It can also be a useful security or human resources tool. Some uses include: Geofencing can also be used to prevent drones from entering secure areas, like airports, outdoor event spaces, and the White House. It’s also possible to geofence some firearms and prevent them from firing in areas where they are not permitted to fire. When not used correctly, geofencing can present major privacy problems. It’s not always a good thing for your apps to know where you are. Especially if this location data can give away personal information about you. If a company sets up a geofence near a hospital it could provide records of frequent visitors, indicating possible medical issues. A geofence by a place of worship could give insight into someone’s religious beliefs. An advertising agency might set up a geofence near a women’s reproductive health clinic to send ads to anyone in the proximity about alternatives to abortion, as an agency in Massachusetts did in 2017 . If we’re not careful, geofences can let others know not only where we’re going but also what we’re doing and sensitive information about us. Whether you are subject to geofencing or not depends on the privacy and data laws in your country or region. Individuals can generally prevent it by turning off location services on their mobile devices. Most geofences are associated with mobile apps. So either switching off location services for the device or blocking location permissions for each app will protect against most geofences. If you don’t want to turn off location services but find it annoying when a particular store sends you a push notification every time you pass by on your morning walk, you can also turn off notifications for that store’s app. In general, reducing the number of mobile apps you have and only allowing apps to use your location when needed is a good practice to get into. Ad tracking on mobile phones has gotten out of control in recent years, and keeping your device free from services you don’t need is one way to avoid it. Geofencing is part of everyday life now; it’s almost impossible to escape these virtual boundaries. While they do serve important purposes, they can also be a massive privacy invasion. If you don’t want to give up your location data, take steps to protect your privacy.