Signalling for help when lost or injured on a hike
In many parts of Australia, mobile reception is unreliable or unavailable. If you become lost or someone in your group is injured, knowing how to signal for help, and choosing the right method for the conditions, can make a major difference to how quickly you are found.
Accidents can happen on any walk. A rolled ankle, a fall, a snake bite, or a serious medical issue can turn a routine day into a situation where you need outside assistance. Your best outcome usually comes from two things working together: good pre-trip planning, and clear, consistent signalling once you realise you need help.
What to do if you need help
Before you start signalling, stabilise the situation. Panic burns energy and pushes people into poor decisions. If you are unsure of your location, staying put is often safer than moving, especially late in the day. If you are in a group, staying together prevents separation becoming a second emergency.
If you have reception and enough battery, call 000 and ask for Police. If you cannot speak but can send an SMS, message a trusted contact with your location and ask them to call 000 on your behalf. If you carry a satellite communicator, use it to raise an SOS or to request help based on the seriousness of the situation. If you believe a life is at risk, activate your PLB and prepare to wait.
Rescuers may take time to reach you, so shelter, warmth, and hydration become priorities. Once those are being managed, decide how you will signal and start early. Signals work best when they are consistent, repeated, and supported by more than one method.
How to signal for help
Many rescues begin late in the day when people accept they will be out overnight. Searches often continue in darkness, and ground teams may be moving on foot. Even if you have called 000 or activated a PLB, rescuers still need to find you in the landscape. That is where good signalling matters.
The methods below are listed in a practical order based on effectiveness and safety. In a real emergency, using more than one method at the same time is often the best approach.
1. Blow your emergency whistle
Many modern packs have a whistle built into the chest strap buckle. Before buying extra gear, check your pack. Even if you already have one, carrying a spare whistle is still worthwhile because they are light, cheap, and easy to lose.
Three short, sharp blasts are widely recognised as a distress signal. Treat a whistle as an emergency tool, not something to use casually on the track. A whistle carries further than a voice, and it requires much less energy, which matters if you are injured, cold, or exhausted.
If you need help, use three blasts, then pause and listen. Repeat at regular intervals. A common approach is three blasts every few minutes, with longer listening breaks if you suspect others are nearby. If you hear voices, footsteps, aircraft, or another whistle, respond immediately with three blasts to confirm your location.
If you do not have a whistle
If you have no other option, you may be able to improvise a whistle using grass or a leaf. This is not something to rely on for the first time in an emergency, but it can work as a backup if practiced in advance. Even an imperfect whistle can help if you use it consistently and keep listening for a response.
2. Signal with a torch
A torch is one of the simplest safety items you can carry, even on a day hike. Mobile phone lights are helpful, but phones are often flat by the time help is needed, especially if people have been using maps, taking photos, or trying to find reception.
If you are trying to attract attention, you can flash an SOS pattern (three quick, three slow, three quick). If you already know rescuers are searching nearby, sweeping your torch slowly across open areas is often enough, because search teams will investigate any light source. When you hear or see rescuers, shine the torch toward them and pair it with whistle blasts to lock in your position.
Conserve battery by avoiding unnecessary use. If you need to ration power, use short bursts, then listen and watch between signals.
3. Make your position visible
Visibility markers help both aircraft and ground teams. Use anything bright or high-contrast, such as a pack cover, spare clothing, a survival blanket, or a dry bag. Place it in an open area where it can be seen from a distance, or hang it on a low branch where it catches torchlight.
If you can do so safely, build a large ground marker using rocks, sticks, or other material that contrasts strongly with the surrounding surface. Bigger is better. Aerial searches are usually limited to daylight, so this method is strongest during the day, but ground markers can still help at night when teams are scanning with lights.
Do not sacrifice warmth to create a marker. Staying warm and sheltered comes first.
4. Use a mirror to attract attention
A mirror is one of the longest-reaching non-electronic signalling tools. In clear conditions, reflected sunlight can be seen from many kilometres away, which makes it useful for alerting aircraft, vehicles, or distant hikers.
A dedicated signal mirror works best, but many hikers already carry reflective items. Some compasses include a mirror, and a phone screen can work in a pinch, although it will not be as bright as a mirror. Aim the reflection toward your target and create flashes rather than a steady beam. Three distinct flashes is more likely to be interpreted as distress than a constant glint.
This method is daylight only, and it works best in open terrain where aircraft or distant observers have a line of sight.
5. Signal fire
A signal fire can be effective, but it is also the highest-risk signalling method. Only use a fire in a genuine life-threatening situation, and only if conditions allow you to keep it small, controlled, and safe. In many parts of Australia, lighting a fire is restricted or illegal, especially on Total Fire Ban days. A fire that escapes becomes a far more serious emergency.
During the day, smoke is the main signal. At night, a bright flame is easier to see. If you can, position the fire where it will be visible, such as a clearing or an open ridge, but do not travel far from your safe position just to find a better site. Clear a wide area around the fire, keep fuel small and manageable, and extinguish it fully once it is no longer needed.
If conditions are wet, windy, or dangerously dry, do not attempt a fire. Use a whistle, torch, mirror, and visibility markers instead.
6. Arm signals
Arm signals are mainly for communicating with aircraft. If you need help, raise both arms overhead in a clear “V” shape and hold it as long as you can. A single raised arm can be mistaken for a wave and should not be relied on as a distress signal.
If you do not require assistance, signal clearly by raising one arm straight up while the other is placed across your chest. Be deliberate and consistent to reduce confusion.
7. Listen
Listening is not a signal, but it helps you connect with rescuers once they are close. Conversation can be good for morale, but it can also drown out footsteps, voices, whistles, vehicles, or aircraft. Build pauses into your signalling so you can hear replies and respond quickly.
If you are calling out or using a whistle, stop after each set of signals and listen for five to ten seconds. The first sign of help is often faint, brief, and easy to miss if you are making noise.
Final note
Effective signalling is simple, but it needs consistency. Start early, stay calm, keep yourself sheltered, and use multiple methods together where possible. A whistle and torch combination is one of the most practical systems for most hikers, with mirrors and visibility markers adding strong daylight options. The goal is not to do everything perfectly. The goal is to be found.
Perhaps you might consider updating this article to include the Satphone-based communications devices such as Spot and inReach. These do not suffer from the “all or nothing” conundrum that PLBs do and for a large and sparsely populated country like Australia (with such patchy mobile phone coverage) they offer significant advantages over “traditional” signalling methods. Yes that comes at a cost, but we can all ask ourselves what price we put on safety and on reduced anxiety for our loved ones.
Thanks for your comments.. Agree I failed to mention devices such as InReach. I’ll make an update on that for signalling. The reason I have not spoken about navigation devices or available tech is that the article is not about navigation or the use of technology. It’s about how to signal for help if you are lost or injured and unable to continue or if your communication devices don’t work. It’s more about sharing some manual techniques rather than rely on tech.