Getting lost in the mountains is frightening, but it is also survivable, and most lost walkers are found quickly when they do the right things. The danger rarely comes from being lost itself; it comes from panic, which drives people to rush downhill, split up, or keep walking into the night. Whether you have strayed off a marked trail or the fog has swallowed every landmark, the same calm sequence gives you the best chance of a safe outcome.
Stop and stay calm
The moment you realise you are lost, stop moving. Sit down, have some food and water, and give yourself time to think. Mountain rescue organisations teach the STOP sequence: Sit, Think, Observe, Plan. Panic makes people walk faster and think worse, usually downhill into steeper, more dangerous terrain. Staying put for twenty minutes costs nothing and often reveals that you know more about your position than fear suggested. Keep your group together; never split up to search.
Work out where you are
Once calm, try to relocate yourself. Retrace your steps mentally: when did you last know exactly where you were? Look for big, unmistakable features like valleys, rivers, ridgelines and peaks, and match them to your map. Check your compass bearing against the direction you expected to travel. If you have a phone with GPS or a downloaded offline map, use it now, but conserve battery. If you can confidently retrace your route to a known point, do so carefully; if you cannot, do not wander hoping to stumble onto the trail.
Signal and get found
If you cannot self-rescue, make yourself findable. The international distress signal is six blasts on a whistle or six flashes of a torch, repeated every minute; the response is three. A whistle carries far further than shouting and saves your voice. Make yourself visible: bright clothing, a spread-out emergency blanket and movement in open ground all help searchers. Call emergency services if you have signal, giving your planned route, last known position and group details. At nightfall, stop travelling and shelter in place; moving in the dark multiplies every risk.
Prevent it happening again
The best rescue is the one that never happens. Always leave your route and expected return time with someone reliable before you set out. Carry a map, compass and the knowledge to use them, plus a headtorch, whistle, extra warm layer and emergency shelter on every mountain walk, whatever the forecast. Check the weather, turn back when conditions or daylight run short, and treat navigation as a continuous habit, checking the map regularly, rather than something you do only when lost.
Being lost is a situation, not a verdict. Stop, think, try to relocate, signal clearly, and stay put when in doubt. Prepare properly before every walk, and you will rarely need any of this.