What is Geofencing?

What geofencing means

Geofencing is a virtual boundary drawn around a real location on a map, such as a depot, a customer site, or a restricted zone, that triggers an automatic alert when a tracked vehicle or asset enters or exits it. The boundary itself is not physical. It exists only in the platform, defined by GPS coordinates.

The concept turns location data into an event instead of something someone has to watch. Without geofencing, knowing whether a vehicle reached a site means checking the map or waiting for a phone call. With a geofence in place, the platform raises the alert the moment the boundary is crossed.

Geofences can be as simple as a circle around a single address or as specific as a polygon that follows the actual boundary of a large site, such as a mine or a distribution centre, so the alert only fires when a vehicle actually enters or exits the site, not when it passes nearby on a public road.

How geofencing works

A geofence is defined by a shape, either a radius around a point or a custom polygon, and stored against a location in the platform. As a tracked vehicle or asset reports its GPS position, the system checks that position against every active geofence.

When the position crosses a geofence boundary, the platform generates an event: entry, exit, or in some setups, dwell time exceeded a threshold. That event triggers a notification, typically email, SMS, or an in-app alert, and is also logged for later reporting.

Accuracy depends on how closely the geofence shape matches the site. A circular geofence around a large site with an irregular boundary can either miss entries near the edge or fire false alerts from traffic on an adjacent road. A polygon geofence traced to the actual site boundary avoids both problems, at the cost of more setup effort.

Why geofencing matters for Australian operators

Depot and site arrival is the most common use. Instead of a driver calling in on arrival, or a dispatcher checking the map manually, the geofence event confirms arrival and departure automatically, which feeds directly into route planning and customer ETA accuracy.

Restricted-zone alerts matter for safety and compliance on mine sites, construction sites, and other locations where unauthorised vehicle entry could put someone in danger. A geofence around a restricted zone flags entry immediately, rather than relying on someone noticing a vehicle where it should not be.

After-hours and unauthorised-use detection is another common application. A geofence around a depot combined with an after-hours time window flags a vehicle leaving the yard outside rostered hours, which is often the first sign of unauthorised use before it becomes a bigger problem.

Common geofencing use cases

Customer site proof of arrival gives operators an automatic, timestamped record that a vehicle reached a delivery or service location, useful for resolving disputes about whether and when a job happened.

Depot check-in and check-out replaces manual sign-in processes with an automatic log of which vehicles are on site and when they left, which also supports Chain of Responsibility evidence around vehicle movements.

Mine site and restricted-zone boundaries use polygon geofences matched to the actual site layout, since the consequences of a missed or false alert are more serious than on a standard depot geofence.

Geofencing and related concepts

Geofencing is a feature built on top of the same GPS data that powers fleet tracking, and it applies equally to powered vehicles and to non-powered equipment monitored through asset tracking.

See Ctrack's geofencing solution for how boundary alerts work on the platform.