When the phone signal drops three hours from the bitumen and you're still a day from anyone who'd notice you missing, the little plastic device clipped to your pack becomes the most important piece of gear you own. PLBs, EPIRBs and satellite messengers all promise to bring help when things go pear-shaped, but they aren't the same thing — and grabbing the wrong one because it was on special at BCF can be an expensive mistake.
This guide walks through what each device actually does, how much you should expect to spend, and which one suits the kind of trips you do. No fluff, no scare tactics, just what we'd want our mates to know before they head bush.
Quick answer (TL;DR)
- PLB — for hikers, solo trekkers, 4WD tourers. Rugged, registered to a person, no subscription, push-button SOS only. Around $350–$600.
- EPIRB — for boaties offshore. Registered to a vessel, often float-free, designed for marine use. Around $400–$900.
- Satellite messenger — for two-way comms, tracking and check-ins. Subscription required. Around $400–$800 plus $20–$80/month.
If you only buy one device for general bush camping and 4WD touring, get a PLB. If you want to stay in touch with the family while you're off-grid, add a satellite messenger on top.
What each device actually does
PLB (Personal Locator Beacon)
A PLB is a one-way emergency beacon registered to a person. You activate it by extending the antenna and pressing the SOS button. It transmits a 406 MHz distress signal to the international Cospas-Sarsat satellite system, which routes it to the Australian Maritime Safety Authority (AMSA) Joint Rescue Coordination Centre. AMSA then dispatches the appropriate response — police rescue, ambulance, helicopter, whatever fits.
There's no subscription. You buy it, register it free at beacons.amsa.gov.au, and it sits in your pack until needed. Battery life is typically 7+ years on standby, with around 24–48 hours of continuous transmit once activated.
The catch: it's one-way. You press the button, help comes. You can't tell rescuers what's wrong, you can't cancel a false alarm easily (you can — you ring AMSA on 1800 641 792 — but it's awkward), and you can't check in with home.
EPIRB (Emergency Position Indicating Radio Beacon)
An EPIRB is essentially a PLB built for boats. It's bigger, often float-free in a hydrostatic release bracket, and registered to the vessel rather than a person. The technology is the same — 406 MHz to Cospas-Sarsat — but the form factor and rules around when you must carry one differ.
If you're heading offshore, certain coastal waters by jurisdiction require an EPIRB by law. Check your state's maritime regulations. For inland adventures, an EPIRB is overkill and a PLB serves you better.
Satellite messengers
Satellite messengers (Garmin inReach Mini 2, ZOLEO, SPOT X) use commercial satellite networks — usually Iridium — to send and receive text messages, share location tracks with family, and trigger an SOS that goes through Garmin's response centre or similar. They work two-way, which is the killer feature.
Subscription is unavoidable. Plans range from around $20/month for basic check-ins to $80+/month for unlimited messaging. You can suspend the plan when you're not travelling, but most touring families just keep it ticking over.
The trade-off: more failure points than a PLB. Battery needs charging, software needs updating, subscription needs paying. Treat it as a comms tool, not a replacement for a PLB.
What to look for when buying
For a PLB
- GPS-equipped — non-negotiable in 2026. GPS-enabled PLBs transmit your location to within metres. Without it you're a dot in a 5km circle.
- Battery life — minimum 7-year storage life, minimum 24 hours transmit. Most quality units sit at 7–10 years and 30+ hours.
- Buoyancy — the unit should float upright with the antenna clear of the water. Test it in the bath at home if you ever paddle creeks or cross rivers.
- Manual GPS entry — some allow you to manually punch in coordinates if the unit's GPS hasn't locked yet. Useful in dense canopy.
- AMSA registration — only buy units approved for use in Australia. Imported beacons registered overseas won't route properly.
For a satellite messenger
- Iridium network — proper pole-to-pole coverage. Globalstar (used by older SPOT units) has gaps over the Australian outback.
- Standalone vs paired — units like the Garmin inReach Mini 2 work standalone but are far easier to type messages on when paired to a phone via the Garmin Messenger app.
- Battery life — look for 14+ days in 10-minute tracking mode. Charging in the bush is a hassle, less is more.
- Subscription flexibility — month-to-month plans you can suspend. Annual contracts only suit full-time grey nomads.
Common pitfalls we see
- Forgetting to register the PLB. An unregistered beacon still triggers a rescue, but AMSA has no idea who you are or what your trip plan looks like. Registration takes 5 minutes online and is free.
- Leaving the PLB in the vehicle. If you're hiking 6km from the truck and you roll an ankle in a creek bed, the beacon in the glovebox is useless. PLBs go on your pack, not in the cab.
- Treating the messenger as the main safety device. Subscriptions lapse, batteries die, software hiccups. The PLB is dumb-rugged and that's the point. Carry both, or just the PLB if you're only buying one.
- Trip plan in your head. Tell someone your route, your turnaround time and when to call AMSA if they haven't heard from you. The beacon brings rescuers to your coordinates — the trip plan tells them roughly where to look while you're triggering it.
- Buying secondhand. Beacon batteries are non-replaceable for the user and have a service date stamped on the unit. A second-hand beacon two years from expiry is poor value.
Real-world tips from the road
- Test-mode your PLB once a year. Most units have a self-test that confirms battery and GPS without triggering a real alert. Check it before every big trip.
- Update your AMSA registration whenever your trip plan or emergency contact changes. Old contact details are a real headache for rescuers.
- Keep your satellite messenger's preset messages current. "Camp made for the night, all good" is more useful than "test message 1".
- Power your messenger and other devices off-grid with a small portable power bank. Even a modest 10,000 mAh bank gets you a fortnight of inReach top-ups between vehicle charges.
- If you tour as a couple, register the PLB to whoever's most likely to use it. AMSA needs to know who they're looking for.
Powering your safety kit off-grid
Your PLB doesn't need power — that's the beauty of it. Your satellite messenger, GPS, phone, head torch and InReach pairing all do. A small 12V setup running off your auxiliary battery, plus a couple of 12V charging accessories, keeps everything topped up without flattening the cranking battery. We've covered the basics in our electronics guides if you're putting together a proper touring rig.
And if you're heading really remote — Simpson, Cape York, Kimberley — a Starlink Mini setup sits alongside (not instead of) your PLB. It gives you proper internet for trip planning, weather updates and family video calls, but it's a comms tool. The beacon is the safety device.
Bottom line
If you camp anywhere outside reliable phone coverage — and that's most of regional Australia — a PLB is cheap insurance. Around $400, no subscription, lasts a decade. Buy one, register it, clip it to your pack, hope you never need it.
Layer a satellite messenger on top if you tour with family who like to hear from you, or if you do solo trips where two-way comms makes a real difference to safety. Keep both up to date and trust them to do their job when the day comes.
Got a beacon story or a setup that works for you? Drop a comment below — we read them all.
FAQ
Do I need a PLB if I have a satellite messenger?
Not strictly, but most experienced travellers carry both. The PLB is the dumb-rugged backup with no subscription and a 7+ year battery. The messenger is the daily comms tool. They serve different jobs.
How do I register a PLB in Australia?
Free at beacons.amsa.gov.au. You'll need the unit's hex code (printed on the beacon), your contact details and an emergency contact. Update the trip plan section before any major trip.
Can I take a PLB on an aeroplane?
Yes, in carry-on. Lithium battery rules apply — most PLBs sit well within limits. Notify the cabin crew if asked. Check current Civil Aviation Safety Authority rules before flying.
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