Choosing an RTLS for site safety: a buyer's guide

A real-time location system reports where tagged people or assets are within a defined area. The single biggest driver of cost and complexity is how precisely you need that location. Zone-level awareness answers which building, floor or zone someone is in, which is exactly what evacuation, mustering, lone-worker cover and access control require. Precise location answers where to the metre, which matters for a narrow set of problems such as forklift-pedestrian collision avoidance or tool-level asset tracking.

Buyers get this backwards surprisingly often, specifying metre-level precision across a whole site to solve a safety problem that only needs to know who is in which zone. The result is far more fixed infrastructure and cost than the outcome justifies. Start from the safety outcome you actually need and let that set the precision, not the marketing.

RFID reads a tag as it passes a fixed point. It is robust, low-cost per tag, and well suited to detecting people and assets at gates, muster points and zone thresholds. It gives you zone awareness rather than continuous coordinates, which is precisely what accountability needs.

BLE (Bluetooth Low Energy) offers proximity and zone-level location with long tag battery life, making it economical for wide-area asset tracking and welfare where metre accuracy is not required. UWB (ultra-wideband) measures signal time-of-flight to locate tags to sub-metre precision, but needs a denser grid of fixed anchors and a bigger install, so it costs more and suits targeted precision problems. Wi-Fi can approximate location using existing access points, trading accuracy for reuse of infrastructure you already own.

None of these is best in the abstract. RFID and BLE give you affordable, reliable zone awareness across a whole site; UWB gives you precision where a specific hazard demands it. A sensible design often blends them, zone awareness everywhere, precision only where it earns its keep.

What safety outcome am I buying? Tie every requirement back to evacuation, mustering, lone-worker cover, access or asset control, and be wary of precision you cannot connect to an outcome.

Does it count people without any human interaction? For safety, a system that depends on people scanning or pressing a button will fail some of the time under stress. Passive reads of a carried tag are far more dependable.

What does it produce as evidence? A safety RTLS should generate timestamped, auditable records, muster reports, attendance trails, alert logs, that stand up to an investigation or a regulator.

How much fixed infrastructure does it need, and where is the data stored? Denser precision grids cost more to install and maintain; data residency and certification matter for procurement. Confirm both before comparing headline tag prices.

Will it fit the systems I already run? Access control, HR and payroll, time and attendance and reporting tools should integrate, so the RTLS adds a safety layer rather than a silo.

The Salvus Network is designed around the zone-awareness case that most site-safety outcomes need. Safety Detection Points read a carried safety tag at the gates, muster points and thresholds that matter, giving continuous zone awareness with no scanning, no queuing and no app, and optional precise location where a specific hazard justifies it.

Because the reads are passive, evacuation, mustering, lone-worker duress, asset tracking and access all run on the same live picture, and every event leaves a timestamped record with UK data residency behind it. The result is an RTLS specified for accountability and compliance, rather than a precision-tracking system pointed at a safety problem it was not designed for.

If you want the underlying concepts in plain terms first, our RTLS explainer covers how real-time location systems work and where zone awareness beats precision, and the glossary defines RFID, UWB and BLE individually.