Distress Beacons Frequent Questions and Answers
RCCNZ's own wording, corrected facts, and now actually in MSL's voice — everything you need to know about choosing, registering, and using a distress beacon.
A distress beacon is the one piece of safety gear you buy hoping you'll never need to use. When you do need it, though, nothing else comes close. Here are the questions we get asked most often about how they work, which type suits which situation, and how to use one properly in New Zealand.
How Distress Beacons Work
What is a distress beacon?
A distress beacon is a small electronic device that, when activated, transmits a signal to satellites overhead. That signal alerts the Rescue Coordination Centre New Zealand (RCCNZ) that you're in a life-threatening situation and, on GPS-equipped models, exactly where you are.
What is 406 MHz and why does it matter?
406 MHz is the digital frequency modern distress beacons transmit on. It's fast, accurate, and carries a unique identification code. When your beacon is registered, that code lets RCCNZ pull up your emergency contacts and details immediately, cutting out guesswork and speeding up the response.
Why did satellites stop monitoring 121.5 MHz and 243 MHz beacons?
Satellite processing of the old analogue 121.5 MHz and 243 MHz frequencies ceased in February 2009, following guidance from the International Civil Aviation Organization and the International Maritime Organization. The 406 MHz digital system is faster, more accurate, and carries far fewer false alarms, so international effort shifted entirely to it. If you're still holding an old analogue beacon, satellites can no longer detect it at all.
What is the Ground Segment, and what do LUTs and MCCs do?
The Ground Segment is the network of receiving stations that turns a satellite signal into a rescue response. Local User Terminals (LUTs) pick up the beacon signal relayed by satellites and calculate its position. Mission Control Centres (MCCs) take that output and pass alert and location data through to the right search and rescue authority.
Which Mission Control Centre handles beacons registered in New Zealand?
Beacons activated and registered in New Zealand are processed through the Australian Joint Rescue Coordination Centre's Mission Control Centre in Canberra, which works in cooperation with the New Zealand Local User Terminal. From there, the alert is passed to RCCNZ in Lower Hutt to coordinate the actual search and rescue response.
Types of Beacons and Choosing One
What's the difference between an EPIRB, a PLB and an ELT?
An EPIRB (Emergency Position Indicating Radio Beacon) is registered to a vessel and designed to float, often activating automatically on immersion. A PLB (Personal Locator Beacon) is registered to a person, small enough to fit in a pocket, and activated manually, making it the standard choice for trampers, hunters and lone workers. An ELT (Emergency Locator Transmitter) is hard-wired into an aircraft and can activate on impact or manually. All three now come in GPS-equipped versions.
Why are GPS-equipped beacons recommended?
A standard 406 MHz beacon narrows your position to within roughly 5 kilometres using satellite triangulation alone, which can still mean a slow search in rough terrain. A GPS-equipped beacon transmits your exact coordinates with the alert, typically pinpointing your location to within about 50 metres, letting rescuers move straight into a rescue rather than a search.
Should I buy a beacon from overseas?
We'd strongly advise against it. Every country has its own 406 MHz country code, and a beacon coded for another country will alert the wrong rescue authority when activated, causing a dangerous delay. A beacon bought overseas can't be registered here unless its coding is changed to New Zealand's country code (512), which typically means sending it back to the manufacturer or an authorised NZ agent.
Registration, Testing and Everyday Use
Who is RCCNZ?
The Rescue Coordination Centre New Zealand manages all Category II search and rescue missions across the New Zealand Search and Rescue Region. When your beacon is activated, a satellite detects the signal and RCCNZ begins coordinating the rescue. RCCNZ is based in Lower Hutt and operates as part of Maritime New Zealand, a Crown agency.
When should I use a distress beacon?
Distress beacons are for life-threatening situations only. Try other means of getting help first where possible, such as radio or, if you have signal, your phone. Don't rely on a phone alone though, since it can be out of range, flat, or water-damaged exactly when you need it most. Read your specific beacon's instructions before you're in an emergency, not during one.
What is a beacon operational test?
An operational test is a check that confirms your beacon's signal is being correctly processed by the Cospas-Sarsat satellite system, rather than just confirming the unit powers on. This is different from a basic self-test light, and it's worth doing periodically, particularly on an older unit or one that's been in storage.
What if I accidentally activate my beacon?
Turn it off and contact RCCNZ immediately on 0508 472 269 (or +64 4 577 8030 from overseas) so a search isn't launched needlessly. If you're flying, ask Air Traffic Control to notify RCCNZ. If you're on the water, pass a message through Coastguard or your local Coast Radio Station. There's no penalty for an accidental activation, but have the beacon serviced afterwards to confirm the battery still has adequate life remaining.
What are the problems caused by false alarms?
Every beacon activation is treated as a genuine emergency until proven otherwise, so false alarms tie up scarce search and rescue resources that a real emergency elsewhere might need. Most false activations happen because the switch has been bumped in a pack or vehicle. Keeping your registration current means RCCNZ can often resolve a false alarm with a single phone call rather than deploying a search.
Travel, Servicing and Disposal
Will my beacon work overseas, or in remote spots like the West Coast?
Yes to both, provided your beacon is registered here in New Zealand first. Cospas-Sarsat operates worldwide, so a NZ-registered beacon works anywhere on the globe. In deep gorges or under heavy overhangs, geostationary satellites can struggle with line of sight, but the low-orbit satellites will still pick up the 406 MHz signal, even if it takes a little longer to raise the alert.
Can I take my beacon on an aircraft?
Yes, but declare it to your airline first. Beacon batteries can trigger issues at security if carried undeclared in cabin baggage, and airline rules on this vary, so check with them directly. Make sure the switch is secured in the off position before you pack it.
What do I do with an old 121.5 MHz beacon?
Don't throw it in general rubbish. An active beacon in a landfill can trigger a real (and expensive) search and rescue response. Contact RCCNZ on 0800 406 111 for your nearest disposal option, courier it to RCCNZ directly, hand it to your nearest Police station, or return it to the retailer when you buy your replacement 406 MHz beacon.
A note on battery life: PLBs and EPIRBs aren't built to the same battery spec. PLBs are typically rated for a minimum of 24 hours of continuous transmission, while EPIRBs run roughly twice as long, at a minimum of 48 hours, reflecting the longer response times often involved in marine emergencies. Check your specific model's rating rather than assuming one figure applies to every beacon type.
We stock the GME MT610G GPS Personal Locator Beacon, a compact IP68-rated PLB with a 7-year battery, built for exactly the land-based emergencies covered above. If you're still weighing up which class of beacon suits your situation, our EPIRB and PLB registration guide goes into more depth, and our Personal Locator Beacon Hire page is worth a look if you only need one for an occasional trip rather than year-round.
Got a specific situation you're trying to cover, whether that's a forestry crew, a boat heading offshore, or a one-off tramping trip? Get in touch and we'll point you to the right device.
Related posts
- August 20, 2026
Wi-Fi mesh gives one seamless network across a whole property. Real hardware MSL stocks, and when mesh beats a wired...
- August 12, 2026
A dead radio channel doesn't wait for a convenient moment. Here's the audit process MSL runs on NZ sites to...
- August 11, 2026
Most rural New Zealand properties need one of three things, not all three. If you get no cellular signal at...