Coverage Map (RTLS)
An RTLS coverage map is a measured drawing of positioning quality on a real layout. It records where error stays inside an aisle, where the pin jumps a bay, and where location is unusable. Color or labels mark those pockets against racks, mezzanines, docks, and charge clusters. It is not a vendor heatmap from an empty lab, and it is not a Wi-Fi RSSI plot reused as a location promise.
The map is the plant document that sits between a brochure centimeter line and a purchase. UWB can be 30 cm under line of sight. Loaded steel aisles add NLOS and multipath. Only a survey on your floor, with inventory in the racks and a tag on a real truck, shows which job each pocket can support: bay, aisle, or zone. That is the argument in ask for a coverage map, not 30 cm on the slide.
Put the map on the same hall model operators already use. A hole next to a pick face is actionable. A PDF in a kickoff deck is not. In twinzo that means positions and areas on the facility twin, so coverage, no-go rules, and live pins share one picture.
Key Components
Layout base: The actual hall, including racking, mezzanines, and doors, not a simplified empty rectangle.
Measured error, not average centimeters: Score aisle-stay vs aisle-jump on a real loop. An average of 40 cm with bay jumps fails picks and can still pass zone analytics.
Operational states: Racks loaded, another truck in the worst parking slot, mezzanine charging at shift end, dock door open and closed. One mid-shift empty-lane walk is not a map.
Tag mount as used: Cage, cabin roof, or mast guard. Hand-held chest-height surveys do not represent forklifts.
Fit-for-purpose zones: Green where the job is proven, amber where the pin jumps under load, red where you will not claim a safety rule.
Applications in Manufacturing and Logistics
Use the map to split radio spend. Dense UWB only where a wrong aisle stops a pick or a no-go alert. BLE or even WMS pins where zone is enough. That mix is how RTLS stays cost-honest instead of copying one accuracy line onto the whole roof.
Finance meetings should show the same drawing. ROI is trusted search, fewer empty rides, and alerts people still read. Those outcomes follow proven zones, not a lab number. Logistics analytics (spaghetti, dwell, congestion) still pay at aisle level once the pin is trusted there.
Benefits and Challenges
A coverage map stops two failure modes: buying centimeter UWB for jobs that needed a zone, and claiming safety rules in pockets the radio cannot support. It also shows where a new survey is due after a racking change.
The work is a walk, not a slide. If a vendor cannot produce the map on your hostile aisle, you have a lab number wearing a plant logo. Treat that as incomplete proof.
Related Terms
Coverage quality is driven by LOS, NLOS, and multipath on time-of-flight radios such as UWB. A logistics heat map shows traffic density, which is a different drawing. Both can live on the same digital twin.
Frequently Asked Questions
Is a Wi-Fi heatmap a coverage map? No. A Wi-Fi heatmap is usually signal strength for data networking. RTLS coverage is positioning error versus the job (bay, aisle, zone) with a tag mounted as operations will use it.
Who should walk it? Operations plus the vendor. Logistics knows the worst parking slots and charge clusters. The vendor knows the engine. Neither walk alone is complete.
How often do we redo it? After major racking, mezzanine, or dock changes, and whenever the live map starts arguing with drivers in a pocket that used to be green.
Can we certify receiving and copy it to high-bay? No. Open receiving is the easy LOS case. High-bay is the NLOS case. Measure both.