When something goes wrong outdoors, being found quickly can be the difference between a scary afternoon and a genuine emergency. Rescue teams cannot help you if they cannot see or hear you, so signalling is a survival skill in its own right. This guide explains how to call for help in the UK, how to make yourself obvious to searchers on the ground and in the air, and the simple kit that turns a lost walker into an easy find.
Call for Help First
Your phone is the fastest rescue tool you own. In an emergency dial 999, or 112, which works across Europe and reaches the same operators. When the call handler answers, ask for the service you need: the police coordinate inland mountain and lowland rescue, while HM Coastguard handles anything on the coast, cliffs, beaches or estuaries. Say clearly what has happened, how many people are involved and whether anyone is injured. Stay on the line so the operator can guide you and log your position.
If you have a weak signal, a call may still connect even when you cannot browse or text, because your phone will use any available network. If you truly cannot get a voice call out, you can contact 999 by text, but only if you have registered your phone in advance by texting the word 'register' to 999. Do this today, before you need it. It takes two minutes and could save your life on a hill with patchy coverage.
Give Your Location Precisely
Rescuers cannot reach a location you cannot describe. The two systems used across the UK are what3words, which turns any three-metre square into three simple words, and the Ordnance Survey grid reference, printed on OS maps and generated by apps such as OS Maps. Either is far better than saying you are near a big tree. Read the words or the grid reference out slowly and clearly, then repeat them so the operator can confirm.
Describe your surroundings too: nearby landmarks, the path you were on, the last signpost you passed and the direction you were heading. If you are talking to the emergency services, they may send a link that pins your location automatically, so keep your phone charged and follow their instructions. Note the time and your plan in a waterproof notebook if you have one, so you can relay a clear, consistent story if the call drops.
The Whistle: Your Loudest Signal
Sound carries further than a shout and costs far less energy. A pealess safety whistle can be heard well over a kilometre and keeps working long after your voice has given out. The internationally recognised distress signal is six blasts in quick succession, spread over a minute, followed by a minute of silence, then repeated. Rescuers reply with three blasts to say they have heard you, so keep signalling steadily and let them home in.
Three of anything, whether blasts, shouts or flashes, is the general call for help, while six per minute is the classic mountain distress signal. Either will be understood. Keep a whistle on a lanyard or clipped to your rucksack strap where you can reach it instantly, not buried in a pocket. Even young children can use one, which makes it invaluable for family walks in the hills or along the coast path.
Light and Mirror Signalling
By day, a signal mirror is astonishingly effective. Angle the reflective surface so the bright spot sweeps across a searcher, an aircraft or a distant building; the flash can be seen for many miles in sunshine. Most survival mirrors have a small aiming hole, so line up the bright dot on your target through it. A phone screen, a piece of foil or a polished mess tin will do the job in a pinch.
After dark, light does the talking. A head torch keeps your hands free and lets you flash the six-per-minute distress signal, or spell SOS as three short, three long, three short. A steady torch left switched on, or a glow stick tied to a length of paracord and swung in a circle, makes a moving light that draws the eye. Carry spare batteries, because a dead torch signals nothing.
Being Seen from the Air and Ground
Search teams and helicopters look for anything that does not belong in the landscape. Wear or lay out bright, contrasting colours: a high-visibility vest, an orange survival bag or a foil blanket stands out against green and grey. Movement helps too, so wave both arms slowly above your head, which doubles as the ground-to-air signal that you need help. Choose open, higher ground where you can be seen from a distance.
If you can, make large symbols on open ground using rocks, gear or trampled snow, at least a few metres across so they read from the air. A large 'V' means you require assistance, while an 'X' means you need medical help. Standing with both arms raised in a Y shape says yes, pick me up. Keep every signal simple, bold and in a clear space well away from trees.
Stay Put or Move?
In most cases the safest thing to do is stay where you are, especially once you have called for help and given a location. A stationary casualty is far easier to find than a moving one, and wandering often takes you into worse terrain, uses precious energy and pulls you away from the spot rescuers are heading for. Find shelter from wind and rain, insulate yourself from the cold ground, and keep signalling at regular intervals.
Only move if staying put is genuinely dangerous, such as rising water, rockfall or exposure with no shelter, or if you must reach a phone signal or a landmark you have already described. If you do move, leave clues: an arrow of stones, a note, anything that shows searchers your direction. Tell the emergency services before you go, and stick to the plan you agreed with the operator.
Signalling by Day and by Night
Your best signal changes with the light. In daylight, reflective flashes, bright colours and bold ground markings win, and smoke from a small, safe fire can also draw attention on a clear day. Movement and contrast are everything, so position yourself on open, high ground where searchers can pick you out against the landscape from a long way off.
At night, everything switches to light and sound. A torch or head torch flashing the distress signal is visible for miles across dark country, and a whistle carries beautifully in still night air. Conserve your batteries by signalling in bursts rather than continuously, and listen for the reply. If a helicopter approaches, point your light at the ground near you, not at the crew, so you do not dazzle the pilot.
If You're Lost Right Now
Stop and stay calm, because panic burns energy and clouds judgement. Dial 999, ask for the police if you are inland or the Coastguard if you are on the coast, and give your what3words address or OS grid reference. If you cannot speak, use registered 999 text. Then make yourself easy to find: put on bright clothing, ready your whistle for six blasts a minute, and set your torch to flash after dark.
Now stay put somewhere sheltered and keep signalling at regular intervals until help arrives. Keep your phone warm and its battery topped up, answer any callbacks, and follow every instruction the operator gives you. Rescuers are on their way, and your job is simply to be seen and heard. Steady, repeated signals from one spot are exactly what turns a search into a rescue.
