Few topics generate more debate among hikers than emergency communication. Some argue that everyone should carry a Personal Locator Beacon (PLB). Others say a satellite communicator makes a PLB unnecessary. This debate is usually framed as a choice between devices. In reality, it is a question of systems, failure modes, and redundancy.
This article explains what PLBs and satellite communicators are designed to do, how they differ, and why many experienced hikers choose to carry a PLB even if they also carry other technology.
Start with the problem, not the device
Emergency devices exist to solve a specific problem:
How do you reliably alert search and rescue when you cannot self-rescue and other systems have failed?
Messaging, tracking, and convenience features are secondary. When framed this way, the differences between PLBs and satellite communicators become clearer.
What a PLB is designed to do
A Personal Locator Beacon has one purpose: to trigger a rescue when a life is at risk.
When activated, it sends a high-powered distress signal directly into the international search and rescue system. In Australia, this system is coordinated by the Australian Maritime Safety Authority.
PLBs are single-purpose emergency devices. They require no subscription, are registered at no cost in Australia, and use long-life batteries measured in years. There are no menus, no messages to compose, and no nuanced judgement required once activated. The simplicity is deliberate.
Battery chemistry matters
PLBs use lithium metal batteries rather than rechargeable lithium-ion cells. This distinction is significant.
Lithium metal batteries have a shelf life of roughly five to ten years and are extremely stable in storage. They do not depend on charging discipline, cables, power banks, or cold-weather battery management.
Satellite communicators and phones rely on rechargeable lithium-ion batteries. These degrade over time, lose capacity in cold conditions, and depend on the user maintaining charge and managing power.
This difference places PLBs outside the normal failure chain of consumer electronics.
What a satellite communicator is designed to do
Satellite communicators are multi-function devices. They typically provide two-way messaging, tracking, weather updates, and SOS capability.
Their strength is early communication. They allow hikers to update contacts, explain delays, adjust plans, and request non-urgent assistance. This nuance can prevent unnecessary search operations and reduce uncertainty for family and authorities.
A message such as “Delayed by a flooded creek, safe but late” carries context. A PLB cannot provide that context.
This is not a binary choice
PLBs and satellite communicators solve different problems at different stages.
A satellite communicator is excellent for managing uncertainty and escalating situations gradually. A PLB is engineered for guaranteed distress signalling when conditions are extreme, judgement is impaired, and fine motor skills may be compromised.
They are not interchangeable.
Signal strength and terrain
PLBs transmit on the international 406 MHz distress frequency using a significantly higher-powered signal than consumer satellite communicators.
In practical terms, PLBs transmit at around 5 watts. Satellite communicators operate at much lower power levels. In deep gullies, dense forest, heavy canopy, or alpine valleys, this power difference can matter.
Satellite communicators are reliable tools. PLBs are engineered specifically for worst-case conditions.
Failure modes stack quickly
When something has gone seriously wrong, failures rarely occur in isolation. Batteries drain faster than expected. Devices are dropped, soaked, or crushed. Screens crack. Software freezes. Fingers lose dexterity. Decision-making degrades under stress.
A PLB is designed to operate when these failures are already present.
This is why many experienced hikers carry a PLB even when they also carry phones, power banks, GPS watches, or satellite communicators.
Redundancy is rational
Carrying a PLB does not mean you expect rescue. It means you recognise that preparation reduces risk but does not eliminate it.
Redundancy is standard practice in aviation, medicine, and emergency services. Applying it to hiking is not dramatic. It is structured risk management.
Group considerations
On many hikes only one emergency device is carried. Some pairs or small groups choose for each person to carry a PLB.
This removes single points of failure. Separation, injury to one member, or pack loss does not eliminate emergency signalling capability.
Registration is part of the system
A PLB is only as effective as its registration data. In Australia, registration is free and can be updated online. Keeping contact details current and updating trip information where possible improves response speed and clarity.
Carrying a PLB is passive safety. Maintaining its registration is active safety management.
False alarms and hesitation
A PLB is an all-in device. Once activated, it signals a life-threatening emergency.
Satellite communicators provide earlier escalation options and clarification. However, if you genuinely believe a life is at risk, never hesitate to activate a PLB.
In Australia, there is no charge for a legitimate search and rescue operation. Fear of cost should never influence a life-or-death decision.
What PLBs are not
PLBs are not substitutes for planning, navigation skills, or judgement. They are not communication devices and they are not a licence to take greater risks.
They are a last-line safety tool.
Choosing your system
Every hiker’s system is different. Some carry only a phone. Others add a power bank or satellite communicator. Some choose to include a PLB as a final redundancy layer. None of these choices are inherently wrong. What matters is that they are intentional and based on understanding how systems fail.
Final thoughts
PLBs and satellite communicators are not competitors. They are tools for different stages of the same problem.
A satellite communicator helps manage uncertainty.
A PLB exists for the moment uncertainty is over.
Many hikers carry a PLB not because they expect to use it, but because they understand how quickly conditions, bodies, and technology can fail.
That is judgement.
Summer Alyse Victor Allan
Hmmm. Which to take. I have a PLB but not the others. Mostly because I don’t want the subscription service and I’m pretty confident with my navigation and safety skills
What do you think is the most critical feature of a PLB or satellite communicator when hiking in remote areas—signal strength or battery reliability?
Trail Hiking Australia do you believe these tools have opened up the door to many who wouldn’t of previously ventured outdoors and not suitably prepared or experienced to?
Irene Adventurette yes, this is called “risk compensation”. Where people increase risk behaviour as safety measures increase. It happens in sports, financial markets and other areas. I often reflect that I probably wouldn’t go on my solo bush walks without my satellite messenger / PLB combo.
Eric Zehrung do you think for the wild places, tools like this have caused more harm than good?
Irene Adventurette I’d only be speculating. There might be data someplace about rates of back county tragedy over time.
Irene Adventurette yes. I do think they have provided a safety net that too often means people may not plan as thoroughly as they could. I actually wrote an article about that here. https://www.trailhiking.com.au/preparation/plbs-safety-nets-not-shortcuts-why-self-reliance-matters/
Trail Hiking Australia it would be interesting (yet completely unattainable) to see where bushwalking and the wild places would be now, if these tools weren’t ever made available to ppl. Would there be less destruction of our bush, would there be more fatalities, would ppl actually put the time in to learn bush skills, would animals still be wild and wary of humans, would the people venturing out into these wild places have more respect for them than we do now?
Irene Adventurette that’s an interesting question and I suspect the reality would be mixed. Technologies have always changed how people interact with wild places. Maps, GPS, lighter gear, and now satellite communicators have all lowered barriers to entry in different ways.
In some ways that means more people experiencing the outdoors, which can be positive if it builds appreciation for these places. But it can also mean people entering environments they don’t yet fully understand.
From a safety perspective, tools like PLBs have undoubtedly saved many lives. At the same time, they work best when they are part of a broader system of preparation: skills, planning, judgement, and respect for the environment.
In my view the goal isn’t to wish the technology away, but to keep emphasising that these devices are a last-resort safety net, not a substitute for bush skills or good decision-making.
Trail Hiking Australia wild places were never meant to be easy! The whole point of stepping into the backcountry is that it demands something from you. Effort, patience, skill, humility. You earn the view. You earn the silence. You earn the moment when an animal appears and you realise you’re a guest in its world. But more and more, technology is flattening that experience. Apps, constant GPS guidance, endless online guides, social media location drops, lightweight gear that removes every hardship. It’s turning wilderness into another easily consumable product. A place to tick off, photograph, and move on from. When access becomes effortless, numbers explode. And when numbers explode, the consequences follow. Trails widen into dusty scars, fragile plants get trampled, rubbish appears where none should exist, and animals that once moved freely begin to retreat further and further away from people. Wildlife pays the price first. Birds abandon nesting sites. Wallabies and wombats shift their feeding patterns. Predators move away from areas they once ruled. What was once a functioning ecosystem slowly becomes a disturbed landscape constantly adjusting to human presence. The irony is that in trying to make nature accessible to everyone, we risk destroying the very thing people came to experience in the first place. Wilderness should challenge us. It should filter people a little. Not everyone needs to stand on every peak, walk every trail, or reach every hidden waterfall. Some places should remain quiet, remote, and difficult. Places where animals still behave naturally and where the land isn’t constantly adapting to human traffic.
Because once wild places become crowded, predictable, and easy… they’re no longer truly wild. And that would be a very sad loss for both nature and us 😢
Irene Adventurette I understand what you’re saying and there is definitely huge value in wild places demanding effort, skill and humility, and in them remaining wild. That’s part of what makes those experiences meaningful, and it’s something I’ve written about in other articles.
This particular post is about PLBs and satellite communicators. Technology has changed how people access the outdoors, but tools like PLBs have also saved many lives. For me the key point is that they’re a last-resort safety net, not a substitute for bush skills, planning or respect for the environment.
Trail Hiking Australia not aimed at your post. But I think widening access to wild places is a mistake. When technology removes the challenge, it also removes the protection. Humans have a habit of destroying the very places they claim to love 😢
Irene Adventurette I truly understand the concern. Increased access to wild places does bring real pressures and sadly we’re seeing that in many areas where wilderness is becoming something to consume.
The reality though is that we can’t turn the clock back on technology. What we can do is keep emphasising skills, planning, Leave No Trace principles, stewardship, and respect for the places people visit.
In my view the goal isn’t to make wilderness “easy”, but to help people approach it with the right mindset and preparation. If more people learn to plan properly and see themselves as guests in these environments, and as stewards of them, that’s a step in the right direction.
Trail Hiking Australia but they aren’t. We humans are seemingly built for destruction. Hope your goal is reached, but I think we both understand, its already been lost 😥
Irene Adventurette it would be equally interesting to see where our wild places would be if they weren’t constantly promoted by tourism agencies, influencers, and content creators who post curated images of incredible locations without any context on safety, difficulty, or conservation. I’d argue our bush is impacted far more by the ‘digital lure’ of a perfect photo and by commercial motivations than by the carrying of a PLB. If we want people to have more respect for these places, perhaps we should look at how we share them in the first place. PLB’s and communicators have certainly reduced peoples concerns about risk but these safety tools can’t really be blamed for the impact of over-promotion and over-use of these wild places.
I work in a research team that travels widely. We have a combination of InReach and RescueMe devices. For regular users 2-way comms is very useful for getting help that’s non-emergency. PLB is great backup. My iPh16pro has sat-comm capability but I’m not sure how reliable, so I also have a PLB.
Devices such as SPOT & InReach can struggle to get a signal out if used very often (expedition with daily check-in) and can fail to send a signal strong enough to be received. InReach can confirm sent OK.
Dale Chircop. Keith’nYvonne Muller
I have a spot tracker so family can keep track of my location and I can sent “I’m ok”, “reached destination” messages. I also have a PLB for my rescue strategy.
Thank you, Darren, for the excellent piece.
Zoleo?
Andy Grope is that a question or a recommendation ?