Worker safety underground,
where GPS doesn't reach.
Across the Grand Paris Express programme, teams work in tunnels, underground stations and restricted technical areas - environments where traditional positioning is simply unavailable. Pole Star delivers continuous worker location without GNSS, directly on the mobile devices field teams already carry.
Four new metro lines under construction
Consistent coverage across every critical area
The project covers underground transport infrastructures where high reliability and resilience are non-negotiable.
Project scope
Field teams equipped with professional mobile devices, operating in underground and restricted environments.
Safety-critical environments where positioning normally fails
As part of the Grand Paris Express programme, teams operate across four new metro lines under construction. These large-scale transport infrastructures include complex and safety-critical environments - underground stations, tunnels and restricted technical areas - where traditional positioning technologies are unavailable.
Ensure reliable worker location, reinforce worker safety, and support effective alert management.
Limited visibility, confined spaces and the presence of isolated workers require a solution capable of delivering continuous, accurate location data and rapid response capabilities.
Location built into the devices field teams already use
Pole Star delivers a multi-technology worker location service integrated directly into the professional mobile devices used by field teams - providing continuous location across underground environments, without reliance on GNSS.
No new hardware for workers
The service runs on the professional mobile devices field teams already carry - nothing extra to issue or maintain.
Positioning without satellites
Multi-technology positioning combining LTE and BLE signals keeps location continuous where GNSS cannot reach.
Visibility everywhere it matters
Coverage throughout stations, tunnels and technical zones - the areas where isolated workers are most exposed.
Adapts as the site evolves
A mobile-based deployment model that adapts easily to evolving construction phases and operational constraints.
Reliability is the requirement, not a bonus
The solution maintains reliable performance in harsh underground conditions - the environments where a location gap has the highest consequence.
A robust and flexible location architecture
The architecture ensures reliable and scalable location services across complex metro infrastructures.
NAO® Mobile SDK
For smartphone-based worker location, embedded in the professional devices field teams use.
NAO® BlueSpot V4 Rugged
Designed specifically for underground and industrial environments.
Multi-technology positioning
Combining LTE and BLE signals to keep location continuous where satellites can't reach.
Clear safety and operational benefits
Improved protection of field teams
For workers operating in underground and confined environments.
Real-time visibility
Across stations, tunnels and critical technical zones.
Reduced reaction time
In case of incident, through geolocated alerts.
Enhanced coordination
With emergency services when intervention is required.
Built for evolving projects
Adapted to large-scale and evolving transport infrastructure programmes.
Where positioning normally stops, continuous location keeps working - giving real-time visibility on every worker and geolocated alerts when seconds matter.
If your teams work where GPS stops, location shouldn't
Tunnels, basements, plant rooms, confined technical areas - we can walk you through how continuous worker location works in the environments that defeat satellites.
- Multi-technology positioning, no GNSS required
- Runs on the professional devices teams already carry
- Geolocated alerts for faster incident response