What geofencing is
Geofencing is drawing a virtual boundary, a fence, around a real place, and using it to decide where an ad runs. In mobile advertising it usually means showing an ad to a phone that enters the zone. In digital out-of-home it means something cleaner: the screens do not move, and their locations are known, so a geofence simply selects the fixed screens that sit inside the zone you drew.
The zone can take a few shapes. A radius is a circle around a point, say half a mile around each of your stores. A neighbourhood or district is a named area. A catchment is the realistic pull area of a location, the streets people actually come from. Whichever you use, the result is the same: instead of buying a whole city, you buy only the screens where your audience already is. It is a way to spend a budget where it counts, which matters as much on a national flight as on a first campaign.
How geofencing is used
Three patterns cover most of it. The point is always the same: put the message on the streets that lead to an action, and skip the rest.
Retail catchment. A shop, restaurant or showroom draws people from a defined area. Fence that area, buy the screens inside it, and the ad runs on the exact streets that feed the door. Because the plays are logged, you can then tie those screens to a lift in store visits. This is the workhorse pattern for anyone with a physical location, and it fits real estate marketing too, where a listing or development wants the immediate neighbourhood, not the whole metro.
Event zone. A conference, match or festival concentrates your audience in one place for a few days. A zone around the venue, run in the hours around the event, reaches that crowd without paying for the rest of the city.
Competitor conquesting. Fence the area around a rival's locations and run a message to people already in a buying mindset. It is a precise, honest use of location: you are reaching real intent, in a real place, and paying only for the screens inside the fence.
How Blindspot targets a zone
$0
per-play floor inside the zone
0M+
screens to fence, worldwide
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countries covered
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hours to live
On Blindspot, geofencing is just how you build a plan. You open the map, draw a radius or an area around the point you care about, and the screens inside the zone load with their per-play price and live availability. You add the ones you want, and you can draw several zones in one campaign, each with its own set of screens and its own hours. There is no minimum spend and no media buyer in the middle, so a zone can be a few blocks or a whole catchment.
The zone is one of three layers of control, and they stack. The geofence decides where, the hourly grid decides when, and a live trigger decides the moment: weather, temperature, air quality, stock and crypto prices, live sports scores, or a custom live-data feed. So a coffee brand can run only on the screens within a few blocks of its cafes, on the morning commute, and only when it is cold. That is moment targeting and geofencing working together.
The precision pays back in measurement too. Because a fenced buy runs on known screens and every play is logged, Blindspot can tie those screens to a lift in visits and report the cost, for example about $0.82 per incremental store visit. So a retail catchment is not only tighter spending, it is spending you can prove, which is the honest case for drawing the fence in the first place.
If you would rather not draw every zone by hand, Blinky, the free AI planner, reads a one-line brief, picks the districts your audience clusters in, and proposes the screens and hours, which you can then adjust. Campaigns go live in about 48 hours after an operator approval that takes roughly two business days. Start from the booking flow or browse screens and draw your first zone.
Draw the zone, and the budget stays on the streets that count.
Geofencing in DOOH, in one line