What is RTLS?
Real-Time Location Systems (RTLS) are technologies that show the live position and movement of equipment, assets, and people within a defined area such as a factory, warehouse, hospital, museum, farmyard, or pretty much anywhere. Unlike GPS, which provides global outdoor positioning, RTLS delivers precise, indoor-friendly location intelligence tailored to your facility.
It’s kind of like having a facility specific google map for just your assets. With manufacturers and other industries under increasing pressure to respond quickly to customer/market demands and avoid problems in advance, the kind of visibility into operations that RTLS offers can be a game changer. For those reasons, RTLS has become a critical component of the Smart Factory, Digital Transformation, and Industry 4.0 transformation.
But let’s get back to basics.
At its core, RTLS helps you manage flow on the shop floor by answering three essential questions in real time:
- What is moving?
- Where is it?
- When did it get there?
For example, RTLS can visualize which engine component (what) is being tested at station 5 (where) and that it’s been there for 45 minutes (when), so you can answer questions like: When will testing be done? Is the next station ready? Are we building a bottleneck?
If you want to know where Work Order 15932 is in the factory right now or how long it has been sitting before testing, RTLS can answer those questions.
How RTLS Works
RTLS technologies vary based on the specific needs of a facility. Here’s a deeper dive into some of the most common technologies:
Ultra-Wideband (UWB): Offers high-precision tracking, making it ideal for environments where foot-level accuracy is crucial. UWB operates by measuring RF signal propagation making it ideal for precise location in cluttered environments.
Bluetooth Low Energy (BLE): Provides a cost-effective solution for room-level tracking. BLE beacons transmit signals to nearby devices, which can then determine their proximity and location.
Wi-Fi–Based Systems: Utilize existing network infrastructure to provide facility-wide coverage. These systems are suitable for large areas and can integrate seamlessly with other networked systems.
RTLS vs. RFID: What’s the Difference
Although RTLS and RFID are often mentioned together, there are some key differences.
Passive RFID (Radio Frequency Identification) uses very low-cost tags that respond when energized by a reader with its ID. The reader can be anything from hand scanners to fixed portals that scan hundreds of RFID tags at the same time. RFID is great for quick, point-in-time identification. For example, confirming the arrival of items as they pass through a dock door or a warehouse entry arch. However, RFID generally needs a clear line of site and only provides the approximate location at the point of scan.
In contrast, RTLS provides continuous, automated location updates as assets move throughout the space with no additional scanning required. RTLS is similar to having a whole video of where items traveled versus RFID where you get a few snapshots. With RTLS you’re not just seeing when a work order entered the job shop floor, you can see exactly what stations it is at now, how long it’s been there, which station it was at last. There is a wealth of data in the real time flow of information.
In short, RFID is ideal for basic identification and inventory checks. It’s like having a few snap shots of where items are at set times. RTLS, in turn, is great for real-time movement, workflow intelligence, and automated monitoring. More like a full video of where everything was over time. And of course, there are times when a combination of RTLS and RFID is the best solution. For example, you might RFID-tag individual kit parts, then track the cart carrying the kit via RTLS.
Learn More About RTLS
This overview provides a quick introduction. For a deeper dive into RTLS technologies, use cases, accuracy ranges, costs, industry trends, and system comparisons, explore our full guide here: