Your Duty of Care Under the HSWA
The Health and Safety at Work Act 2015 requires every business to take all reasonably practicable steps to protect workers from harm, and that duty does not stop at the office door. For anyone working remotely, alone, or somewhere mobile coverage is patchy, reliable communication is part of the legal baseline.
Relying on personal mobile phones creates a real gap. Deep valleys, forestry blocks and steel-reinforced buildings all block or weaken signal, often exactly where the risk is highest. Push-to-talk is also instant: no dialling, no waiting to connect, and a group call reaches everyone on the channel at once.
A professional radio system on its own dedicated frequency, independent of the public cellular network, is one of the clearest ways to demonstrate due diligence. It is a tangible, auditable step showing you identified communication as a risk and acted on it.
Safety Features That Do the Heavy Lifting
Modern digital radios go well beyond push-to-talk. These are the features that turn a communication device into a safety tool.
| Feature | What It Does | Why It Matters |
|---|---|---|
| Emergency Button | One press sends a network-wide distress signal that takes priority over other traffic | Gives a call for help the best chance of getting through in a chaotic moment |
| Lone Worker Monitoring | Prompts a periodic check-in and raises an alert if the worker does not respond | Catches a problem even when the worker cannot call for help |
| Man Down Alert | An internal sensor detects a fall or prolonged lack of movement | Flags an incident automatically, with no action needed from the worker |
| GPS Tracking | Sends real-time location to a supervisor or dispatch | Cuts response time by removing the guesswork of where to send help |
| Noise Cancellation | Filters machinery, wind and engine noise from transmissions | A safety message only works if it is actually heard |
These features are generally found on digital radios rather than basic analogue sets, so if lone worker compliance matters for your business, confirm the specific model includes them. Our man down detection guide covers how the sensors and alert networks work in detail.
Choosing the Right Frequency and Getting Licensed
UHF and VHF are different tools for different terrain. UHF's shorter wavelength gets through concrete, steel and dense bush, making it the standard for construction sites, built-up areas and forestry blocks. VHF's longer wavelength travels further across open country, which is why it is the standard for large farms, marine work and open rural land.
Why Licence-Free Channels Are a Safety Risk
Many businesses default to the licence-free PRS band because it is free, but public channels are exactly that, public. Chatter from nearby sites, hobbyists or other businesses can interrupt an emergency transmission at the worst possible moment. A private licence from Radio Spectrum Management (RSM) gives your business a dedicated, interference-free frequency, and digital radios on a licensed frequency can use encryption to keep conversations about medical events or staff welfare private.
Current RSM annual fees, GST inclusive, effective 1 July 2026:
| Licence Type | Covers | Annual Fee |
|---|---|---|
| Standard licence | A single frequency or simplex use | $190 |
| Land mobile, up to 5 repeaters | Up to five repeater locations | $800 |
| Land mobile, unlimited | Unlimited repeater locations | $1,800 |
Designing the System for Your Site
A safety radio system has to match the environment it is used in. Forestry crews working in genuine black spots often pair vehicle-mounted radios with high-gain antennas, and where there is no cellular backhaul at all, satellite can carry alerts out from otherwise unreachable ground.
Larger construction sites with several subcontractors benefit from splitting traffic across dedicated channels, such as crane operations, traffic management and site health and safety, while keeping a shared emergency channel that overrides them all. Multi-storey and basement builds often need a repeater or distributed antenna system to remove dead zones in stairwells and lower floors.
Whatever the site, train everyone on the emergency button and check-in process. Under pressure, people do what they have practised.
How NZ Industries Actually Use This
Forestry and Agriculture
Long-range VHF is the standard across large, open properties where the nearest cellular tower might be an hour away. A lone worker mustering stock or felling timber stays in contact with base without relying on a phone signal that was never there.
Construction Sites
UHF's ability to get through concrete and steel makes it the standard on busy, multi-level sites. A crane operator needs a constant, clear line to the dogman on the ground, through noise and structural interference a phone call cannot handle.
Marine Environments
IP67-rated VHF marine radios are the baseline offshore, built for saltwater and submersion while providing vessel-to-vessel contact, weather alerts and a direct line to Coastguard.
Emergency Services
New Zealand's Public Safety Network, built on P25 technology and now run by SafetyNet Critical Communications, lets Police, Fire and Emergency NZ and ambulance services share a common, interoperable radio network. Most commercial users will not need P25, but it shows how a shared standard underpins safety at national scale. See our Public Safety Network guide.
Getting It Right with Mobile Systems
Meeting your obligations is not about buying the most expensive radio on the shelf. It is about matching the right frequency, features and licensing to how your team actually works, then making sure everyone knows how to use the safety features that matter.
Site Assessment
We identify your actual coverage gaps and risk zones before recommending hardware.
Lone Worker Integration
Man Down, GPS and emergency alerts configured through our worker safety and asset management service.
Licensing Handled
We coordinate RSM licensing through approved engineers so it is one less thing on your plate.
Training and Support
The best safety feature is useless if your team does not know how to use it under pressure.
Mobile Systems Limited has supplied and supported radio safety systems from Mount Maunganui for over 25 years. Browse our two-way radio range, or get in touch for a recommendation against your specific obligations.
