When a lone worker raises an SOS alert, an asset is needed on a busy ward, or a task must be verified at a customer site, a location estimate that is accurate only to a room or building may not be enough. So, how accurate is UWB tracking? In a well-designed indoor deployment, ultra-wideband positioning can achieve accuracy of up to 10 cm. That level of performance makes UWB one of the most precise options for real-time location systems, but it is not a blanket guarantee for every site, device or operating condition.
The useful answer is that UWB accuracy depends on the physical environment, the layout of the location infrastructure, the device being tracked and the outcome required. A system designed to confirm entry into a zone has different requirements from one used to locate the nearest responder or distinguish between assets stored metres apart.
What UWB accuracy means in practice
UWB stands for ultra-wideband, a radio technology that can measure the distance between a wearable or tag and fixed reference points with very high precision. In an RTLS, or real-time location system, those reference points are commonly gateways or anchors installed around the workplace. The system combines those distance measurements to calculate a device’s position.
For workplace operations, accuracy is best understood as the gap between the reported position and the device’s actual position. If a deployment delivers up to 10 cm positioning accuracy, a badge or asset tag can be located with far more confidence than a system that merely identifies the nearest beacon or estimates a device’s position from signal strength.
That distinction matters. A zone-level signal can show that someone is broadly in a production area. Centimetre-level positioning can support more specific decisions, such as identifying whether a worker has reached a designated muster point, whether an item is in the correct bay, or which available operative is closest to a callout.
Accuracy should not be confused with update rate, reliability or precision over time. A position may be highly accurate when reported, but an operational design must also consider how frequently devices report, how consistently they can be located and whether the software presents information clearly enough for people to act on it.
How accurate is UWB tracking compared with BLE and GPS?
UWB is particularly suited to indoor environments where GPS is weak or unavailable. Satellite-based GPS can be useful for outdoor estates, travelling teams and large geographical areas, but it is not designed to reliably identify a person’s location within a floor of a building.
Bluetooth Low Energy, or BLE, is often effective for proximity, room-level visibility and lower-cost location use cases. A BLE badge can identify nearby beacons or gateways, and it can support presence information across a workplace. However, BLE positioning based on radio signal strength is generally more affected by walls, people, shelving and changing environmental conditions than UWB distance measurement.
UWB is the stronger choice where close-range indoor accuracy directly affects safety, service delivery or asset control. Examples include locating a worker during an emergency, allocating a task to the nearest qualified operative, verifying work at a specific location, or finding vital equipment across a complex site.
Many organisations need more than one technology. A practical location strategy may use UWB indoors, BLE for broad presence or low-power proximity, and GPS outdoors. The objective is not to force one technology across every setting. It is to maintain useful location visibility as people and assets move from a warehouse to a yard, from a care setting to a vehicle, or between sites.
The factors that affect UWB tracking accuracy
UWB is highly capable, but the building still matters. Radio signals interact with the real world, so deployment quality has a direct effect on the results operational teams see.
Infrastructure layout and survey quality
UWB gateways or anchors need to be positioned so that tracked devices are visible from enough reference points. Their location, height and spacing must account for the shape of the space, ceiling heights, corridors, racking and areas where people work.
A site survey identifies blind spots and practical installation constraints before the system is relied upon. In a manufacturing facility, tall machinery and metal storage may require a different design from an open-plan hospital floor or a hotel with long corridors. Adding hardware without planning its geometry can reduce the benefit of an otherwise accurate technology.
Obstructions, reflections and line of sight
Concrete, steel, machinery, dense stock and moving vehicles can affect radio propagation. UWB can handle complex indoor environments well, but no location technology is immune to physical obstructions.
The body can also shield a wearable signal. A badge worn on a lanyard, clipped to clothing or carried in a pocket may perform differently depending on its orientation. Good deployment design considers how people will actually wear devices rather than assuming ideal conditions.
Tag placement and device behaviour
The location of an asset tag matters as much as the infrastructure around it. A tag placed inside a metal cabinet or beneath dense materials may be harder to locate than one fixed externally in a clear position. For mobile assets, the device should be installed where it remains protected without being unnecessarily obstructed.
Battery management, firmware configuration and reporting settings also need to suit the use case. A critical safety application may require a different reporting approach from a tool inventory use case. The right configuration balances visibility, battery life and the responsiveness required by the operation.
Calibration, maps and operational zones
A precise coordinate is only useful when it aligns with a usable map and clearly defined workplace zones. If a boundary is drawn directly along a wall or doorway, small normal variations in reported position may create unwanted entry and exit events.
For this reason, zones should be designed with the process in mind. A verification zone around a cleaning point, for example, should reflect the area in which the task can genuinely be completed. Testing real journeys, shifts and workflows is more valuable than validating accuracy from a single stationary test point.
Turning accurate location into an operational decision
The strongest use cases do not stop at showing a dot on a map. They connect location to an event, a workflow and a clear response.
A worker badge can provide verified presence at a designated location and support clocking in or out without relying solely on a self-reported record. A tag on equipment can help a facilities team find an item before a delay becomes a service issue. A location-aware task can be allocated to the nearest appropriate worker, while time and place data can provide proof that the task was completed in the required area.
For safety teams, accurate location can reduce the time needed to identify where help is required after an SOS trigger, missed lone-worker check-in or fall event. The operational response still depends on procedures, training and staffing, but reliable location data gives responders a more specific starting point.
Sense Presence combines proprietary badges, tags, gateways, buttons and sensors with software that can interpret these physical-world events. UWB can provide up to 10 cm positioning accuracy in supported deployments, while BLE and GPS extend coverage across other workplace settings. This allows organisations to use the appropriate location method for each environment rather than treating indoor and outdoor operations as separate systems.
How to set realistic accuracy requirements
Before selecting UWB, define the decision that location data must support. Asking for the highest possible accuracy everywhere can add cost and complexity without improving the outcome. Asking only for room-level location may leave a safety or asset-control gap unresolved.
Start by describing the operational moment. Do you need to know whether a worker is on a particular floor, within a service zone, beside a machine, or at a precise point of work? Then test the requirement in the real environment, including peak occupancy, active machinery, stocked racking and normal movement patterns.
It is also sensible to agree how accuracy will be measured. Specify whether the requirement refers to a typical result, a maximum expected deviation, a defined percentage of readings or performance within designated zones. This prevents a technically impressive claim from being interpreted differently by operations, IT and health and safety teams.
Finally, plan for governance alongside performance. Location data should have a defined operational purpose, appropriate access controls and a clear retention approach. UK organisations should assess their data protection responsibilities, communicate transparently with workers and seek appropriate advice where monitoring may affect employee privacy.
FAQ
Can UWB track people to 10 cm accuracy?
UWB positioning can achieve up to 10 cm accuracy in supported indoor deployments. Actual performance depends on the site layout, infrastructure design, device placement, obstructions and how the system is configured and tested.
Does UWB work through walls?
UWB signals can pass through some materials, but walls, metal structures, machinery and dense storage can affect measurements. A site survey and correctly positioned gateways are essential for dependable workplace coverage.
Is UWB better than GPS for indoor tracking?
For precise indoor positioning, yes. GPS is valuable outdoors but often cannot provide dependable room-level or point-level accuracy inside buildings. UWB is designed for the close-range indoor location use cases where GPS is limited.
Is UWB suitable for lone-worker safety?
It can support lone-worker safety by providing a more precise location when a badge or button triggers an SOS event. It should sit within a complete safety process that includes escalation procedures, response ownership and regular testing. The most useful deployment is the one that gives the right person a reliable location and a clear next action when time matters.