GNSS Helmet for Zero Workplace Accidents! Protecting Site Safety with Real-Time Position Tracking

Table of Contents

• Introduction: A New Trend in Safety Management Aiming for Zero Accidents

• The Current State of Occupational Accidents in the Construction Industry

• What Is a GNSS Helmet?

• Safety Effects Brought by Real-Time Position Tracking

• Benefits of Introducing GNSS Helmets

• Use Cases for GNSS Helmets

• Challenges at Introduction and Future Prospects

• Expanded Possibilities with Simple Surveying Using LRTK

• Conclusion

• FAQ

Introduction: A New Trend in Safety Management Aiming for Zero Accidents

Protecting the safety of people working on site is the top priority across all industries, especially in construction. Construction sites often involve dangerous situations such as working at height or operating heavy machinery, and achieving zero accidents is not easy. However, in recent years, advances in digital technology have greatly evolved safety management methods. Among these, real-time position tracking using GNSS helmets has attracted attention as a safety management approach. This article explains in detail the features, benefits, and safety effects of GNSS helmets and introduces this new trend in safety measures that incorporate the latest technologies.

The Current State of Occupational Accidents in the Construction Industry

Occupational accidents in Japan’s construction industry remain frequent, and calls for strengthened safety measures persist. According to the Ministry of Health, Labour and Welfare statistics (https://www.mhlw.go.jp/stf/newpage_58198.html), the number of fatalities in the construction industry in 2024 reached 232, the highest among all industries.

Looking at the breakdown, falls from scaffolding and high places account for the largest share at about 30% of incidents. Contact with heavy machinery and entanglement with construction materials are also common. Including near-misses and minor injuries, many hazards lurk on sites every day.

In response, national and industry organizations are promoting “zero-accident campaigns” and reviewing safety standards. In addition to enforcing basic measures such as wearing helmets and safety harnesses, expectations are rising for next-generation safety management strategies that use digital technology. One such strategy is real-time tracking of location information using smart helmets that utilize GNSS (Global Navigation Satellite System). This enables constant awareness of “where” and “who” is working, allowing immediate response to danger and preventive measures.

What Is a GNSS Helmet?

A GNSS helmet is a cutting-edge safety device that integrates a satellite positioning receiver (GNSS), communication modules, and various sensors into a conventional protective helmet. In short, it is “a helmet that transmits location information.” GNSS is a general term for global navigation satellite systems represented by GPS, and by using it, workers’ outdoor positions can be measured in real time with high accuracy.

GNSS helmets contain a compact, high-sensitivity GPS/GNSS antenna and receiver, and when worn on the head they can continuously receive stable satellite signals. The acquired position data are sent to a management system via the helmet’s communication functions (e.g., cellular communication or radio), enabling managers to view each worker’s current location on a map on a PC or tablet. This makes it possible to check the whereabouts of all workers at a glance, even on expansive construction sites.

Furthermore, GNSS helmets serve as a platform that can collect various sensor information in addition to location data. For example, accelerometers and gyroscopes can detect falls or impacts, and temperature sensors can monitor environmental conditions or signs of worker health issues (heatstroke risk). These data are also transmitted in real time and can trigger immediate alarms if abnormalities are detected. In other words, GNSS helmets are smart devices that monitor “the location and condition of workers.”

Safety Effects Brought by Real-Time Position Tracking

The GNSS helmet’s core feature—real-time position tracking—brings various benefits to site safety management. The main points are listed below.

• Preventing entry into hazardous zones: If dangerous or restricted areas are preconfigured in the system, automatic alerts can be issued when a worker approaches those areas. By setting up “invisible fences” on the map for high-altitude work zones, crane operation ranges, or areas at risk of collapse, human-error-driven dangerous entries can be prevented.

• Preventing collisions with heavy machinery: With improved GNSS positioning accuracy, the relative distance between workers and heavy machinery can be monitored precisely. If position trackers or geofencing technologies are also implemented on machinery, alarms can sound when a person comes within a certain distance, or the machinery can be automatically slowed or stopped. This can help prevent collisions with backhoes or forklifts.

• Rapid rescue in case of falls or drops: If a worker falls or drops from a height, the GNSS helmet’s position data can immediately identify the exact location. Previously, finding injured persons on large sites could take time, but a position-tracking system enables instant identification of “where someone has fallen,” allowing rapid rescue. Combining this with automatic notification triggered when the helmet’s accelerometer detects a fall ensures that rescue requests are not delayed even during solo work.

• Visualizing work conditions: Real-time awareness of everyone’s location enables supervisors to manage worker placements and movement routes efficiently. It becomes immediately clear where people are concentrated or where coverage is thin, aiding appropriate staffing decisions. Guiding workers to rest or evacuation areas becomes easier, and confirming everyone’s evacuation (roll call) in emergencies can be done instantly on the system.

In this way, real-time position tracking is a powerful tool for “preventing accidents” and “minimizing damage if an accident occurs.” A system of constant monitoring also raises workers’ safety awareness, which can reduce human error and help establish safe work habits.

Benefits of Introducing GNSS Helmets

Introducing GNSS helmets on site yields benefits beyond improved safety. The main advantages are summarized below.

• Dramatic improvement in safety: As mentioned, constant awareness of location and status can greatly reduce accident risks, especially preventing serious incidents like falls and collisions with heavy machinery. Sensor-based monitoring enables early response to health risks such as heatstroke, raising the overall quality of safety management.

• Improved operational efficiency and productivity: Visualizing worker locations and movements through GNSS helmets enables efficient placement planning and smoother process management. For example, supervisors can instantly verify whether workers are at their assigned posts, reducing unnecessary searches and radio communications. Preventing labor concentration that causes work stoppage leads to productivity gains. Real-time remote site visibility also allows supervisors to manage multiple sites efficiently.

• Data accumulation and analytical use: Position and sensor data are stored in the cloud for later analysis and use. Such accumulated data can reveal the most efficient routes for material transport, high-risk areas, or inefficiencies in worker movement. This insight supports layout improvements and feedback for safety training, enabling a PDCA cycle that uses data for continuous improvement.

• Image enhancement and talent acquisition: Adopting cutting-edge safety measures showcases a company’s commitment to safety internally and externally. A workplace where employees feel safe boosts motivation, reduces turnover, and helps attract new talent. Being proactive about safety-management DX enhances trust from clients and contractors.

Use Cases for GNSS Helmets

In what specific sites and applications are GNSS helmets effective? Here are some examples.

• Large-scale construction projects: On extensive civil engineering or building sites where workers are dispersed, management becomes difficult. GNSS helmets display a real-time worker map of the whole site, helping prevent workers from getting lost and optimizing staffing. They also enable centralized management of multiple work teams and improve the efficiency of issuing instructions.

• Tunnel and underground work: In tunnel or underground work, where GNSS signals are hard to receive, it has traditionally been difficult to know worker locations. Recently, efforts to combine GNSS with complementary technologies such as UWB (ultra-wideband) have realized seamless indoor-outdoor tracking. Combining GNSS helmets with auxiliary technologies allows reliable monitoring of workers even in poorly visible underground spaces.

• Work at height and scaffolding: Work on high-rise building structures or bridge scaffolding always carries the risk of falls. GNSS helmets can warn workers when they stray outside designated safe zones, prompting caution and preventing accidents. If an accident does occur at height, the location can be quickly identified, reducing rescue time.

• Maintenance and inspection at plants and power stations: Inspections at facilities containing hazardous areas, such as petrochemical plants or substations, also benefit from GNSS helmets. Predefining no-entry zones and warning workers who mistakenly enter dangerous areas helps prevent electrocution or burns. During large-scale scheduled inspections, managers can remotely monitor multiple workers’ positions for safety.

• Disaster recovery sites: In post-disaster recovery operations after earthquakes or heavy rain, work often occurs amid rubble and mud, making safety assurance difficult. Rescue teams and workers wearing GNSS helmets can coordinate by knowing each other’s positions, contributing to prevention of secondary disasters and improving rescue efficiency. In cases of entrapment, position data enables rapid search operations.

These are just some examples; real-time position tracking with GNSS helmets contributes to both safety and efficiency across various sites. More use cases will likely be developed in the future.

Challenges at Introduction and Future Prospects

Although GNSS helmets are innovative, several challenges exist when introducing them on site. First is the issue of equipment and operational costs. Initial investment is required to equip high-precision GNSS receivers and communication infrastructure, which can be burdensome for small and medium-sized businesses. However, with technological progress and wider adoption, small, lightweight, and cost-effective GNSS terminals are emerging. For example, palm-sized helmet-mounted GNSS terminals weighing just a few dozen grams have been developed, allowing workers to wear them without burden. As device prices fall and services expand, broader adoption across sites is expected.

Addressing environments where GNSS signals cannot reach is another challenge. Not only tunnels and underground spaces but also shadows from high-rise buildings and mountainous areas can interrupt or attenuate GNSS signals. Countermeasures under consideration include installing ground-based reference stations for RTK (real-time kinematic) augmentation, using補強 signals from the quasi-zenith satellite system Michibiki, and hybrid operation with other radio technologies such as UWB or LoRaWAN. Combining multiple technologies enables seamless indoor-outdoor coverage while maintaining centimeter-level accuracy (half-inch accuracy).

Privacy and data management issues must also be addressed. Some workers may feel psychological resistance to constant location monitoring. It is important to clarify that the purpose is to ensure safety and to make data use and management transparent. Rules should be established to prevent using monitoring data for purposes outside safety—such as work-time management or personnel evaluation. Employing the technology while obtaining site consensus and trust helps cultivate a true safety culture.

Looking ahead, safety-management DX tools like GNSS helmets are expected to become more widespread and provide strong support toward zero workplace accidents. Within initiatives such as the Ministry of Land, Infrastructure, Transport and Tourism’s i-Construction and the broader construction DX trend, smart helmets are positioned as a key technology. Future expansions may include integration with AI-based hazard prediction systems and AR (augmented reality) overlays for work assistance. As safety management and digital technology converge, the notion that “dangerous work is normal” can be overturned and a future where people can work safely at any site will become realizable.

Expanded Possibilities with Simple Surveying Using LRTK

The value of GNSS helmets is not limited to safety management. By applying this technology, significant benefits can also be realized for simple on-site surveying. The key is a high-precision positioning technology called LRTK. LRTK is a positioning solution that makes the RTK (real-time kinematic) method easier to use, enabling coordinate acquisition with centimeter-level accuracy (half-inch accuracy).

Traditionally, precise surveying required surveyors using specialized equipment such as total stations or expensive GNSS receivers. With the advent of LRTK, however, site workers can increasingly perform “surveying just by walking” using smartphones, tablets, or GNSS helmets they use daily. For example, by mounting an LRTK-compatible GNSS device with an ultra-thin antenna on a helmet, a worker walking around a site can record their trajectory as high-precision survey data. Hands-free operation means measurement is possible even when both hands are occupied, dramatically improving work efficiency.

In LRTK-based simple surveying, acquired coordinate data are transmitted in real time via Bluetooth to a smartphone and stored in the cloud. Office-based engineers can immediately review the data and, if necessary, instruct additional measurements to the field. Survey results can be reflected in drawings and reports on the same day, substantially shortening what used to take days to measure and digitize. GNSS helmet-collected positioning data also prove powerful for daily progress management and quality control.

Thus, the combination of GNSS helmets and LRTK technology innovates both safety management and surveying tasks on site. If a single device can both prevent workplace accidents and perform surveying, the value of on-site digital tools doubles. Real-time position tracking that ensures safety naturally extends to data acquisition and analysis—enabling smarter site operations.

Conclusion

Real-time position tracking using GNSS helmets is an innovative solution that simultaneously “protects people” and “improves operational efficiency.” Achieving zero occupational accidents on construction sites requires not only traditional experience and grit but also actively embracing technological solutions. GNSS helmets that combine satellite positioning and IoT provide a concrete example of the future of safety management.

Safety is a value that takes precedence above all, and the latest technologies should exist to protect human lives. Visualizing danger through real-time position tracking and preventing accidents contributes not only to immediate safety but also to the establishment of a safety culture. Creating an environment where workers can concentrate on their tasks with the reassurance of being “constantly monitored” will directly improve productivity.

Technologies like GNSS helmets and LRTK positioning symbolize on-site DX (digital transformation). In the coming era, striving for “zero workplace accidents” by combining technology and wisdom will be both a corporate social responsibility and a path to sustainable business development. Why not take on the challenge of building safer, more resilient sites with the powerful tool of real-time position tracking?

FAQ

Q1. How does a GNSS helmet differ from a regular helmet? A1. A GNSS helmet integrates satellite positioning devices such as GPS, communication functions, and sensors into a regular safety helmet. The major difference is that simply wearing it allows real-time awareness of a worker’s location and condition. In other words, it serves as both safety equipment and an IoT device.

Q2. How accurate is the positioning of GNSS helmets? A2. Accuracy depends on the model and environment, but GNSS helmets that support high-precision RTK methods can reduce errors down to a few centimeters (a few inches). Standalone GPS positioning typically has errors of several meters (several ft), but augmentation from correction satellites or reference stations dramatically improves accuracy. In open outdoor areas, workers’ positions can be determined very precisely.

Q3. Is position tracking possible indoors or inside tunnels? A3. GNSS fundamentally relies on receiving satellite signals outdoors, so in tunnels or inside buildings where satellite signals cannot reach, accuracy may decline or positioning may be impossible. However, systems combining other positioning technologies such as UWB (ultra-wideband) or Bluetooth beacons are emerging for use in these environments. By combining these technologies, seamless tracking of people both indoors and outdoors is possible.

Q4. Aren’t there privacy concerns or worries about being monitored? A4. Given the system’s constant monitoring of worker locations, privacy considerations are important. The purpose of GNSS helmets is to protect workers’ lives and safety, not to monitor for shirking or control. On introduction, it is necessary to formalize rules on data handling and clarify that monitoring data will not be used for work-time management or evaluations, thereby preserving workers’ sense of security. With proper operation and trust between management and employees, “being watched over” can be a source of reassurance.

Q5. What is required to introduce GNSS helmets? A5. In addition to the GNSS helmet devices themselves, a system (software) to receive and manage position data and a communication network environment are required. Typically, helmet-collected data are sent to cloud services for viewing and management on PCs or smartphones. To improve accuracy, some regions may use augmentation from the Michibiki quasi-zenith satellite or set up dedicated reference stations. It is advisable to design the system configuration according to the site’s scale and environment when introducing the technology.

Q6. Besides safety management, what other uses do GNSS helmets have? A6. Beyond safety, GNSS helmet position data can be applied to various uses. For example, combined with LRTK technology as mentioned above, workers’ walking trajectories can be recorded directly as survey data for high-precision as-built surveys and quality control. Position data can also be used to visualize work progress and optimize logistics flow, serving as a data source for productivity improvement. The ability to cover both safety and efficiency with one system is a significant added value.