A stadium app that guides you to a restroom or delivers food to a seat needs to know where you are inside a concrete building. Satellite positioning is close to useless there.
Satellites lose the argument with concrete
Positioning signals from orbit are extremely weak by the time they reach the ground, and a roof deck or upper tier blocks them outright. Under cover, the phone is guessing.
Reflections make this worse than a simple loss of signal. A bounced signal arrives late and the phone interprets the delay as extra distance, placing you outside the building.
That failure is invisible to the user, who sees a confident dot in the wrong place. An app that trusts it will route someone to the opposite side of the bowl.
Beacons replace distance with proximity
A beacon is a small transmitter that broadcasts an identifier every fraction of a second. It does not know where it is and it does not track anyone.
The phone hears the identifier, looks up which one corresponds to which surveyed location, and infers that it is nearby. Position becomes a lookup rather than a calculation.
Accuracy is coarse, roughly a section rather than a seat, but a section is usually enough. Concourse navigation needs the right ramp, not the right tile.
Signal strength is a poor ruler
Apps estimate distance from how strong the beacon sounds, and that estimate is badly disturbed by bodies. A packed concourse absorbs radio energy and the beacon appears farther away.
The interference grows as the building fills, meaning positioning degrades exactly when the crowd needs it most. Empty-stadium testing gives misleading results.
Designers compensate by placing beacons densely and treating the strongest one as the answer rather than trying to triangulate. Simpler logic survives the crowd better.
Wi-Fi carries part of the load
Access points are already positioned throughout the venue, and the one a phone associates with narrows location to a similar granularity without new hardware.
This works only where the network was designed with many small cells, which modern stadium builds are, because they need capacity rather than coverage.
Combining the two sources is common: Wi-Fi establishes the general zone and beacons refine it near entrances, elevators and concession stands where precision earns its keep.
Maintenance is the hidden cost
Beacons run on batteries and are mounted above head height throughout a large building. Replacing them is a scheduled physical task, not a software update.
A dead beacon does not announce itself; the app simply gets less accurate in one corridor. Operators monitor for silence rather than waiting for complaints.
That ongoing labor is why some venues abandon beacons and accept coarser Wi-Fi positioning, trading precision for a system with no batteries to change.