Emergency Signals Outdoors: How to Call for Help and Get Found

The first minutes: the STOP rule

Most outdoor emergencies get worse through hasty decisions: pushing on in the dark, taking a "shortcut" down a steep slope, splitting up the group. The STOP rule, taught by many search-and-rescue organisations, gives you a moment to think before you act:

Check the daylight you have left – the daylight calculator shows sunset for any date – and remember that cold, wet and wind are often a greater danger than the original problem. If you are lost rather than injured, try to work out your position with map and compass before you move anywhere.

Calling 112, 911 or 999: what to tell the dispatcher

If you have any mobile signal, a call is the fastest way to get help. 112 is the emergency number in all EU countries and works in many others, including the UK and Switzerland; from mobile phones it often works abroad as well. In the US and Canada the number is 911, in the UK also 999, in Australia 000. Some mountain regions have their own rescue numbers too – in Austria, for example, 140 reaches mountain rescue – but 112 is the safe choice across Europe. Emergency calls are free.

Even if your own network shows no coverage, try the call: many phones can reach the emergency number through another network. If the call fails, climb a little higher or move out of a deep valley and try again – a few metres can make the difference. A text message sometimes gets through when a call does not, but emergency text services in some countries require prior registration, so check before you travel.

How to share your location precisely

"Somewhere in the forest near the lake" costs rescuers hours. Your phone's GPS works without mobile signal, so a map app – ideally with offline maps downloaded before the trip – can show your coordinates anywhere with a view of the sky. Learn where your app displays them before you need it.

Also tell rescuers what you look like and what you have: jacket colour, tent or tarp colour, light, whistle. The better they can picture you, the faster they find you. Knowing the basics of map and compass navigation – grid references, reading the terrain – makes this much easier.

Satellite devices

Beyond mobile coverage, a personal locator beacon (PLB) or satellite messenger can send an alert with your position via satellite. Some newer smartphones offer satellite emergency messaging as well. Register such devices as required in your country, learn how the SOS function works and keep them where you can reach them with one hand.

Stay put or move? Why staying usually wins

Searchers start at your last known position and along your planned route – that is why you should always leave a trip plan with someone at home: route, planned return time and when to raise the alarm. Every kilometre you wander off increases the search area dramatically. A person who stays in one place and makes themselves visible is usually found much faster than one who keeps moving.

While you wait, protect yourself from cold and wet: insulate yourself from the ground, get out of the wind, put on every layer and use an emergency bivvy or blanket (see bivouac and bivvy bag and debris shelter). Where it is safe and permitted, a small fire helps with warmth and morale – see fire starting. Ration nothing except energy: rest, drink, stay warm. Teach children to "hug a tree" – stay in one place and answer calls or whistle – as part of bushcraft with kids.

Waiting for rescue: staying warm, hydrated and findable

After the call, the hardest part begins: waiting. Depending on terrain, weather, daylight and whether a helicopter can fly, help may arrive within an hour or only the next morning. Plan for the longer case. The main threats while waiting are cold, wet and wind – even in summer, a still, injured person cools down fast on damp ground.

Wind makes waiting much colder: at 5 °C, a 20 km/h wind already feels like about 1 °C, and wet clothing makes it worse – the wind chill calculator shows the effect for your conditions. Watch each other for signs of hypothermia: shivering, clumsy hands, slurred speech and confusion. An injured person should be insulated first and never left lying directly on cold ground.

Drink even if you are not thirsty: cold air is dry, and dehydration makes you colder and less clear-headed. If your water runs low, the water needs calculator gives a rough daily figure, and water purification explains how to treat stream water – but do not leave a safe spot to fetch water in the dark. Keep some of your emergency food in reserve; energy-dense snacks from your trail food plan are ideal.

Stay findable the whole time

• Keep the signal kit on your body, not in the rucksack, so you can react within seconds when you hear an engine or voices.
• Signal at intervals – whistle rounds every few minutes, a light sweep at night – then listen. Continuous signalling exhausts you.
• Stay near your ground signal and bright gear. If you must move a short distance to shelter, mark the direction with an arrow.
• Answer every call: searchers work in lines and stop to listen. A whistle reply tells them where to go.

Whistle and light signals: 3 blasts and the Alpine distress signal

A whistle carries much further than your voice and costs almost no energy – you can keep going for hours. Three of anything – blasts, flashes, shouts, fires – is widely understood as a call for help. In the Alps and many other mountain regions, the Alpine distress signal is the recognised standard: six signals in one minute, then a minute's pause, repeated until you get an answer. The same rhythm works with a torch or headlamp at night.

Carry a pea-less plastic whistle on your rucksack strap or jacket zip – it works when wet and frozen. At night, a headlamp is visible over long distances in open terrain; switch to its brightest mode only for signalling to save battery, and carry spare batteries (see headlamps and camp lighting).

Signal mirror: aiming the flash

In sunshine, a signal mirror is one of the most powerful signals there is: a sunlight flash can be seen from aircraft and distant ridges far beyond the range of a whistle. A purpose-made mirror has a sighting hole; a phone screen, a mirror from a compass or a polished tin lid work too, with less precision. The trick is aiming – use your hand as a gun sight:

Ground-to-air signals: V, X and body signals

From a helicopter or plane, a person in a forest is a tiny dot. Large, straight-lined shapes with strong contrast stand out because nature rarely makes straight lines. The international ground-to-air code (used in aviation search and rescue) includes a few simple symbols:

Body signals to a helicopter

When a helicopter approaches, use the internationally known body signals: both arms raised in a Y means "Yes – we need help". One arm raised diagonally up and one down, like the slash of an N, means "No – we do not need help". Do not wave casually at every helicopter – in mountain areas, a friendly wave with both arms can be mistaken for a call for help.

Fire and smoke signals – only where it is safe

By day, a column of smoke can be seen from far away; at night, fire is visible from the air. Three fires in a triangle are a widely recognised distress signal. But a signal fire must never start a wildfire – in dry conditions or where fires are banned, a mirror, light and bright cloth are the better choice.

Read campfire safety for the basics of fire placement and extinguishing, and keep a reliable ignition source in your emergency kit.

A small signalling kit that fits in a pocket

Signalling gear weighs very little and should live in the same pocket all the time, together with your first aid kit. The Kit Builder adds these items to any packing list, and the bushcraft kit list shows where they fit in the overall system. Plan realistic routes with the hiking time calculator so that daylight rarely becomes the emergency.

Understanding the weather helps you avoid many emergencies in the first place – see reading the weather. For more skills, visit all bushcraft skills.

Before you go: the trip plan that starts a search

Every signal in this guide works better when someone is already looking for you. That only happens if a person at home knows where you went and when to worry. A trip plan takes five minutes and is the single most effective piece of emergency equipment – it costs nothing and weighs nothing.

Agree clearly on what "alarm time" means: if you have not checked in by then, your contact calls the emergency number – not the next morning and not after trying your phone twenty times. Tell them what to say: your route, your planned camp, the number of people and your gear. Then stick to the plan. If you change route, send a short message while you still have signal; a search along the wrong valley wastes precious hours. If you realise you will be late but are safe, report in as soon as you can so no one starts a search for nothing.

Make your phone last

Your phone is a radio, a map, a torch and a GPS in one, and its battery is limited. Start every trip fully charged with a power bank. On the trail, use flight mode with GPS still active, switch off background apps and lower the screen brightness; in cold weather keep the phone in an inside pocket, because cold batteries can drop from half full to empty within minutes. Keep 20–30 % in reserve purely for an emergency call. Learn a few basics of navigation without a compass too, so a flat battery does not immediately become an emergency.