Why "It Usually Works" Isn't a Safety Plan
Ask any site manager how their radios perform and you'll usually get a shrug and "yeah, they're fine." That answer is doing a lot of quiet work to avoid a harder conversation, because "fine" is rarely tested against the conditions that actually matter: a lone worker behind a steel tank, a night shift in the rain, a genuine emergency where everyone reaches for the radio at once.
Radios are the nervous system of a working site. When a message doesn't get through cleanly, the site doesn't know it's hurt until something goes wrong. That's true whether you're running a forestry block, a port, a factory floor, a construction site, or a rural property where the nearest help is a long way off.
This matters more than it used to. Amendments to the Health and Safety at Work Act received Royal Assent in July 2026, sharpening expectations on employers to demonstrate they've actually managed risks, not just assumed things were fine. WorkSafe recorded 70 workplace fatalities across New Zealand in 2024. Communication failures aren't the cause of every one of those, but a radio system nobody has tested since installation is exactly the kind of gap that turns a near miss into a headline.
A two-way radio site audit is simply the discipline of finding out, on purpose, before something forces the answer on you.
Mapping the Zones Where Your Radios Must Never Fail
Not every corner of your site carries the same risk, so don't test it like it does. Start by asking a simple question of every area: if a radio call failed here, right now, what's the worst that could happen?
On most industrial and commercial sites, the same zones keep coming up as genuinely non-negotiable:
- Loading docks, yards and marshalling areas where vehicles and people mix
- Fuel storage, chemical handling points and confined spaces
- Stairwells, lift shafts and basement or plant rooms
- Lone worker zones, remote gatehouses and access roads
- Muster points and anywhere an evacuation call needs to land first time
Get your supervisors, health and safety reps, and the people who actually carry the radios into this conversation early. They already know where the signal drops out and where people quietly stop bothering to call in. Treat that knowledge as data, not gossip, because it will save you a lot of walking later.
Turning the List Into a Simple Risk Map
Once you've got your list, put it on a site plan and colour code it. Green for areas where "mostly fine" is genuinely fine. Amber for anywhere patchy coverage is a nuisance rather than a hazard. Red for the zones where a dropped call is not an option.
If you can't point at your site plan and show someone your red zones, you don't have an audit yet. You have a hope.
Running a Proper Coverage Walk and Drive Test
How do you know if a radio actually works somewhere, rather than just usually working? You test it, properly, in the conditions that matter, not the conditions that are convenient.
The method itself is straightforward. Keep one radio at a fixed control point, such as the site office or supervisor's desk. Send a second radio through every zone on your risk map, calling in from each spot and reporting signal quality in plain terms:
- Clear, the message came through with no repeats needed
- Noisy but understandable, the message got through but it took effort
- Unreadable, the call failed or had to be repeated
Test both directions, control to field and field to control, since coverage isn't always symmetrical. Test at different times of day and, where you can, in different weather. A UHF signal that behaves itself on a dry Tuesday morning can fall over completely on a wet Friday night shift, particularly around metal-clad sheds, large tanks, or dense stacking.
Log It Like You Mean It
Write everything down as you go. Location, time, weather, channel, signal quality, and anything unusual nearby such as vehicles, machinery or doors. A simple spreadsheet is enough. Patterns will show up fast, and once they do, you're no longer guessing where the problem lives.
If forklifts keep losing comms at the same corner of the yard, that's not bad luck three times running. That's a real, fixable coverage gap, and now you've got the evidence to act on it.
Spotting Interference and Tired Hardware Before They Bite
Coverage is only half the picture. A radio can sit inside a perfectly good coverage zone and still let your team down, because the problem isn't distance, it's noise or worn-out gear.
While you're walk-testing, listen for the signs of interference as well as dead air. Crackling or buzzing that comes and goes, bursts of unexplained audio, or a channel that sounds busy even when your own team is silent. This shows up most often near heavy power equipment, conveyor systems, and the edges of a property where a neighbouring site or public channel bleeds through.
Give the Kit Itself a Blunt Look
Now turn your attention to the hardware. Count what's actually in circulation, handhelds, vehicle units, chargers, spare batteries, earpieces and antennas, then be honest about how many are taped together, borrowed between teams, or quietly unreliable.
- Check real-world battery run time, not the spec sheet number
- Look for water or dust ingress, especially around seals and battery contacts
- Check for bent aerials, corroded contacts and broken clips
- Confirm channels are correctly programmed, labelled, and understood by the people using them
Where RSM Licensing Fits Into a Radio Audit
An audit isn't just a technical exercise, it's also the point where a lot of sites discover their licensing hasn't kept pace with their equipment. Operating a private, licensed frequency or repeater in New Zealand is governed by Radio Spectrum Management (RSM) under the Radiocommunications Act 1989, and it's a legal requirement, not a nice-to-have.
Low-power devices can sometimes run under a General User Radio Licence, which covers shared, unlicensed channels. Anything requiring a private, interference-free channel, which is most serious commercial and industrial use, needs an individual site licence.
| Licence category | Covers | Annual fee (from 1 July 2026) |
|---|---|---|
| Standard licence | A single land mobile repeater location, or simplex operation on a common frequency | $190 |
| Land mobile (up to 5) | Up to five repeater locations on a common frequency nationwide | $800 |
| Land mobile (unlimited) | An unlimited number of repeater locations on a common frequency nationwide | $1,800 |
If your audit turns up a genuine coverage gap that needs a repeater or a new frequency to fix, licensing has to be sorted alongside the hardware, not as an afterthought. Operating outside your licence, even by accident, risks interference complaints and penalties under the Radiocommunications Act. This is exactly the kind of detail worth checking directly with RSM or a specialist before you commit to a fix.
Getting Your Site Properly Audited
Once you've mapped your zones, walked the site, and logged your findings, sort the results into three honest buckets: issues that risk injury or slow an emergency response, issues that block or slow work, and issues that are just irritating. Anything touching a muster point, fuel area, or lone worker zone goes straight to the top of the list.
Some fixes you can handle yourselves, replacing tired batteries, tightening up channel discipline, standardising kit across teams. Others genuinely need a specialist, particularly repeater placement, antenna design, and coverage through heavy concrete, steel, or underground areas.
Mobile Systems Limited has been designing, supplying, installing and servicing two-way radio systems from Mount Maunganui for over 25 years. We're a brand-independent advisor across Tait, Hytera, Motorola, Icom and GME, so our recommendations are built around what your site actually needs, not which brand we'd prefer to sell. Our mobile technicians provide on-site service across the Bay of Plenty, Coromandel, Rotorua, TaupΕ, South Waikato, Volcanic Plateau and Eastern Waikato, with equipment supply and coordination available nationwide.
What a Professional Audit Adds
Proper RF Assessment
Identifying whether a gap is a coverage, interference, or hardware problem, rather than guessing and buying equipment to see if it helps.
Repeater and Antenna Design
Placement and specification for the site you actually have, not a generic layout.
Servicing and Repairs
Getting tired hardware fixed or replaced through our workshop and mobile technician network.
Licensing Handled Properly
Making sure any new repeater or frequency is correctly allocated through RSM before it goes live.
Whatever you fix and whatever you leave, do this again next year. A single audit is a snapshot. A yearly rhythm, with a shorter check before your busiest or worst-weather season, is what actually keeps a site's communications trustworthy year after year.
