Hazardous Zone Geofencing

Q: How does edge-enforced geofencing work on mobile machines?

The gateway computes the machine position with GNSS/RTK, evaluates it against zone definitions on board, and sends J1939/CAN commands directly to the machine: speed limiting, hydraulic lockout or engine stop. Decisions are made in under 100 ms with no cloud round-trip.

Q: How accurate is the positioning?

GNSS/RTK gives 1 to 3 cm horizontal accuracy on surface operations. IMU-assisted dead reckoning bridges short gaps in satellite coverage.

Q: Does geofencing work underground where GPS is unavailable?

Yes. In GPS-denied underground environments, UWB (Ultra-Wideband) positioning provides localization with less than 1 m error, so surface and underground sites run on a single platform.

Q: Which safety standards does the system align with?

The architecture is aligned with ISO 21815 for earthmoving machine collision avoidance. Audit logs are structured for MSHA surface mobile equipment program requirements and ATEX zone access documentation.

Q: Does it require access to the machine OEM's firmware?

No. Intervention uses standard J1939/CAN commands, so the same system can be deployed across mixed OEM fleets without machine firmware access.

Mobile machines in mining, quarrying, and hazardous industrial sites often operate without real-time zone awareness. Blast areas change, exclusion boundaries shift, and pedestrian workers share space with multi-tonne equipment without automated enforcement. Melqart Systems provides edge-enforced geofencing for every machine: GNSS/RTK positioning, on-board zone evaluation, and direct J1939/CAN machine intervention (speed limiting, hydraulic lockout, and engine stop) without cloud round-trip latency.

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Articulated haul trucks working in a quarry pit

The Enforcement Gap

Exclusion zones require enforced controls, not alerts alone.

Soft alerts depend on operators seeing, hearing, and responding to a warning in time. In mining and quarrying environments, high ambient noise, limited sightlines, and multi-tonne equipment moving at speed make reaction-dependent safety insufficient. Blast zone coordination is managed by radio and manual checks. Pedestrian exclusion zones are marked with cones that offer no physical enforcement. MSHA, ATEX, and insurer audit requirements demand documented zone compliance that manual systems cannot deliver. The enforcement decision moves on-board: the edge gateway evaluates machine position against zone definitions locally and sends J1939/CAN intervention commands directly. No cloud dependency, no reaction time.

Refinery process columns and flare stacks

Edge-enforced zone control

Zone evaluation and machine intervention happen on-board: speed limits and hydraulic lockouts execute in under 100ms without a cloud round-trip.

Blast zone coordination

Automatic machine lockout during defined blasting windows: equipment cannot enter or operate within the exclusion radius regardless of operator action.

Machine-to-person separation

Dynamic exclusion zones around pedestrian staging areas, with enforced machine response rather than operator alerts. This removes the human reaction variable from the safety chain.

Compliance audit logging

Timestamped zone entry and exit records for every machine, every shift: documented evidence for MSHA, ATEX, and insurer audit requirements.

The challenge

Where current approaches fall short

Blast zone coordination depends on radio and manual checks

Blast zones are cleared by radio communication and manual supervisor checks. One missed machine, one radio failure, or one miscommunication can create severe safety exposure. There is no automated enforcement mechanism between a blast order and the machines in the field.

Machine-to-pedestrian incidents are the leading cause of fatalities

In surface mining and quarrying, machine-to-pedestrian collisions are responsible for a disproportionate share of fatalities. Blind spots on loaders, excavators, and haul trucks can prevent operators from seeing workers on foot. Soft warnings do not replace physical separation enforcement.

Compliance documentation cannot be generated from manual systems

MSHA written safety programs, ATEX zone access records, and insurer audits require documented evidence of zone compliance. Paper logs and radio records are incomplete, inconsistent, and do not satisfy modern regulatory standards.

Architecture

How Hazardous Zone Geofencing Works

GNSS/RTK positioning feeds an on-board zone engine that evaluates machine position locally, sends J1939/CAN intervention commands within 100ms, and transmits compliance telemetry to the cloud over LTE/4G.

01
Positioning Layer
GNSS/RTK (surface) or UWB (GPS-denied)
02
Edge Zone Engine
On-board zone evaluation, dynamic risk calculation
03
Machine Intervention
J1939/CAN: speed limit, hydraulic lock, engine stop
04
Backhaul & Compliance
LTE/4G telemetry, audit logs, zone management UI

What's included

The Deployment Package

A complete hazardous zone geofencing stack: GNSS/RTK positioning, on-board zone intelligence, J1939 machine intervention, and compliance logging, ready for serial deployment across mixed machine fleets.

GNSS/RTK Positioning Module

Centimeter-accurate on-machine positioning using GNSS with RTK correction for surface operations. UWB positioning available for GPS-denied underground environments.

On-Board Zone Intelligence

Edge zone engine evaluates machine position against defined exclusion and speed zones locally. No cloud round-trip. Dynamic risk calculation adjusts zone boundaries based on machine speed and heading.

J1939/CAN Machine Intervention

Direct machine control via J1939 or CAN bus: configurable speed limiting in approach zones, hydraulic lockout in restricted zones, and full engine stop in critical exclusion zones.

Compliance Audit Logging

Timestamped zone entry, dwell, and exit records for every machine across every shift. Structured telemetry delivered to your compliance dashboard for MSHA, ATEX, and insurer audit requirements.

Tank yard at a chemical plant with dense pipework and steel drums — Sites with tanks and process equipment are where position-based zone rules matter most.

Specifications

Technical specifications

Positioning Technology

GNSS/RTK for surface operations (1-3cm horizontal accuracy). UWB (Ultra-Wideband) for GPS-denied underground environments (<1m localization error). IMU-assisted dead reckoning to bridge coverage gaps.

Machine Intervention

J1939 CAN bus commands for speed limiting, hydraulic movement inhibit, and engine stop. Configurable intervention levels per zone: advisory, speed cap, hydraulic lock, full stop.

Zone Decision Latency

On-board edge processing delivers intervention commands in under 100ms from position fix. No cloud dependency for safety-critical zone enforcement decisions.

Connectivity

LTE/4G primary for telemetry backhaul and zone definition updates. Store-and-forward local buffer ensures compliance logs are preserved during cellular coverage gaps.

Edge Hardware

Owasys owa5x telematics gateway (IP67/IP6K9K) with integrated GNSS, built for heavy mobile machines and harsh outdoor environments. RTK corrections come from the positioning module.

Compliance & Standards

Architecture aligned with ISO 21815 (earthmoving machine collision avoidance). Audit logging structured for MSHA surface mobile equipment program requirements and ATEX zone access documentation.

Owasys owa5x open Linux telematics gateway with GNSS and RTK positioning, built for heavy mobile machines.

Applications

Use cases and industries

Quarry Blast Zone Management

Automatic machine lockout during defined blasting windows: equipment cannot enter the exclusion radius, regardless of operator action, from blast arm to all-clear signal.

Mining Pedestrian Exclusion

Machine-to-person separation in active dig zones: hard enforcement of pedestrian exclusion areas around zones where people work on foot, with automatic machine slowdown and stop.

Port Terminal Zone Control

Restricting haul trucks and reach stackers from entering crane swing areas and pedestrian access routes, with access logging for port safety audits.

Construction Demolition Perimeters

Speed limiting near pedestrian staging areas and site boundaries during demolition operations, with tamper-proof access logs for contractor compliance reporting.

Oil & Gas Site Access Control

ATEX-compliant zone enforcement near flare stacks, pressurized pipeline areas, and chemical storage zones, with full zone access documentation for regulatory audit.

Underground Mine Safe-Travel Corridors

UWB-based zone control in GPS-denied underground environments: enforcing speed restrictions in pedestrian travel ways and exclusion zones around active mining faces.

Results

Key outcomes

“From radio-based blast coordination to edge-enforced zone control: every machine, every shift, every zone.”

Edge-enforced zone decisions in under 100ms: no cloud round-trip for safety-critical commands.
Automatic blast zone lockout removes the human coordination variable from the safety chain.
Machine-to-person separation enforced by hardware, not by operator alertness.
Timestamped compliance records for MSHA, ATEX, and insurer audit requirements on every shift.
GNSS/RTK for surface and UWB for underground: single platform for mixed site environments.
Serial deployment-ready across mixed OEM fleets without requiring machine firmware access.

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Solution

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Product

Owasys gateways

Authorized Owasys VAR: rugged open Linux gateways with LTE, CAN/Modbus and edge-to-cloud integration. Melqart configures and integrates every deployment.

Industry

Mobile machines

Industrial telematics for mobile machines: resilient connectivity, machine telemetry contracts, and edge-to-cloud pipelines.

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