What Is Geofencing? How It Works in Fleet Tracking

Geofencing is a virtual boundary drawn around a real-world location, such as a job site, a customer address, a yard or a radius around a city, using GPS coordinates instead of a physical fence. Once you set that boundary in a fleet tracking platform, the system checks each tracked vehicle's live GPS position against it and fires a defined action, usually an alert, whenever a vehicle crosses in or out.

The boundary can be a simple radius around a point or a custom polygon that follows a property line or job site perimeter. Which one you pick depends on how closely the zone needs to match the physical space it stands for.

Arrival and departure tracking is the most common use. A geofence around a customer site or job location logs when a vehicle entered and left, which gives you time-on-site data for billing or service-level reports without a driver logging anything by hand. After-hours and unauthorized-movement alerts come second: a geofence around a yard or depot flags any vehicle that moves outside expected hours, which helps deter theft and speeds up recovery if something is taken.

Fleets also use geofences defensively, to flag a vehicle that strays outside its assigned route or service area. On the admin side, a geofence can tag trips that start or end in a specific zone for reporting or IFTA jurisdiction purposes, since it can mark a state or provincial line as easily as a customer address.

No. Both draw a virtual boundary on a map, but fleet geofencing checks the position of your own vehicles, reported by a GPS device installed in each one, while geofence marketing uses the location services on people's phones to show them ads or offers when they walk into an area. Search results for "geofencing" mix the two because the word covers both.

The difference shows in what comes out. A fleet geofence produces arrival and departure times, after-hours alerts and time-on-site reports in your fleet platform, tied to a vehicle and a driver. A marketing geofence produces ad impressions and store visits, tied to anonymous phones. If you are shopping for geofencing to run a fleet, look for it as a feature of GPS fleet tracking, and ask how the zones are drawn, which events they can trigger and who receives the alerts. The legal side differs as well: a fleet geofence follows employees at work, which brings in the workplace monitoring rules covered next.

In Ontario and Quebec, the law expects you to. Ontario's Employment Standards Act requires an employer with 25 or more employees on January 1 to have a written policy on electronic monitoring in place before March 1 of that year, and the province's own example of electronic monitoring is GPS tracking of a delivery vehicle. The policy says whether you monitor, how and in what circumstances, what you use the information for, and the dates it was prepared and changed.

Quebec's Act respecting the protection of personal information in the private sector goes further on notice. Section 8.1 requires anyone who collects personal information with technology that can identify, locate or profile a person to inform that person first of the technology and of how its locating or profiling functions are activated. The law's definition of profiling names the analysis of work performance and behaviour.

Other provinces and US states have their own rules, so check them before rollout. A written policy that names the geofences, the alerts they send and who reads the reports is a sound baseline wherever you operate, and it gives drivers a straight answer before they have to ask.

Geofencing depends on GPS signal and reporting frequency, so it flags a boundary crossing once the platform detects it, a little after the fact instead of to the second. A vehicle moving fast through a very narrow zone can sometimes cross in and out between two position updates. The zone is also only as accurate as the boundary you draw. A radius set too wide around a dense urban job site can trigger a false arrival alert while the truck is still a block away.

For arrival and departure logging and boundary alerts, the job it was built for, geofencing is reliable. Set expectations accordingly, though, and don't treat it as a substitute for live, second-by-second vehicle tracking.

Most geofence problems are drawing problems. A zone drawn tight to a building's footprint misses trucks parked in the lot, and one drawn over the whole block catches the coffee shop next door. These are the rules High Point GPS uses when it sets up a fleet. Draw customer zones around the whole property, including the lot and the approach, instead of around the building. Give yard zones a margin so a truck idling at the gate counts as home. Keep billing zones separate from alert zones, because a billing zone should be generous and an after-hours zone should be strict. Name zones the way your office talks about them, so reports show customer names instead of coordinates. You can import zones in bulk from a customer list with addresses, and expect to redraw the ones that fire wrong in the first month, which is normal.