What is Geofencing and How Does It Work?
If you've been researching GPS trackers, you've probably come across the term "geofencing." It's one of the most useful features a GPS tracker can offer — but what exactly is it, and how does it work? This guide explains geofencing in plain language and shows you how it can be used to protect your vehicle, manage your fleet, and give you peace of mind.
What is a Geofence?
A geofence is a virtual boundary drawn around a real-world geographic area. Think of it as an invisible fence that exists on a digital map. You define the boundary — it could be a circle around your home, a polygon around a job site, or a zone covering an entire suburb — and your GPS tracker monitors whether the tracked vehicle or asset is inside or outside that boundary.
When a vehicle crosses the geofence boundary (either entering or exiting), the system triggers an alert — typically a push notification, SMS, or email sent to the fleet manager or vehicle owner.
How Does Geofencing Work?
Geofencing works by combining three technologies:
- GPS: The tracker uses GPS satellites to determine the vehicle's precise location in real time.
- 4G LTE connectivity: The tracker transmits location data to a cloud-based tracking platform via a mobile data connection.
- Software logic: The tracking platform continuously compares the vehicle's GPS coordinates against the defined geofence boundaries and triggers alerts when the vehicle crosses a boundary.
Modern GPS trackers like the Techtonika FMC920 and FMM920 support geofencing natively and can be configured through compatible fleet management platforms.
What Can You Use Geofencing For?
1. Theft Prevention and Recovery
Set a geofence around your vehicle's usual parking location. If the vehicle moves outside that zone — especially outside business hours — you'll receive an instant alert. This is one of the fastest ways to detect vehicle theft and notify authorities with a live location.
2. After-Hours Monitoring
For fleet operators, geofencing combined with a time-based rule (e.g., "alert me if any vehicle moves after 6pm") is a powerful tool for detecting unauthorised vehicle use. If a driver takes a company vehicle for personal use outside working hours, you'll know immediately.
3. Job Site Management
Set geofences around customer sites or job locations. Get notified when a vehicle arrives on site (useful for billing and compliance) and when it departs. This removes the need for manual check-ins and provides an accurate, automated record of site visits.
4. Depot and Yard Management
Monitor when vehicles leave and return to your depot. Geofencing makes it easy to track departure and return times, identify vehicles that haven't returned on schedule, and manage yard access.
5. Caravan and Asset Protection
Geofencing isn't just for fleet vehicles. It's equally valuable for caravans, trailers, plant equipment, and other high-value assets. Set a geofence around your storage location and receive an alert the moment your asset moves — even if you're hundreds of kilometres away.
6. Teen Driver Monitoring
Set geofences around approved driving areas for young or inexperienced drivers. Receive alerts if they venture outside agreed boundaries, giving parents visibility and encouraging responsible driving habits.
How Many Geofences Can I Set?
This depends on the tracking platform you use. Most professional fleet management platforms support unlimited geofences, allowing you to create zones for every depot, customer site, or restricted area in your operation. You can typically set geofences as circles (defined by a centre point and radius) or custom polygons for irregular shapes.
Do I Need Special Hardware for Geofencing?
No — geofencing is a software feature that works with any GPS tracker that transmits real-time location data. All of our 4G GPS trackers support geofencing when used with a compatible tracking platform. Browse our full GPS tracker range to find the right device for your needs.
Getting Started with Geofencing
Setting up geofencing is straightforward:
- Install a GPS tracker in your vehicle or asset
- Log into your tracking platform
- Draw a geofence on the map around the area you want to monitor
- Configure your alert preferences (entry, exit, or both; time-based rules)
- Save and activate — you'll start receiving alerts immediately
If you're not sure which tracker or platform is right for your use case, our team is happy to help. Browse our GPS trackers or get in touch for personalised advice.