Giving Your Grid Reference to Mountain Rescue
Call the emergency number first — 999 or 112 in Britain and Ireland, 111 in New Zealand — and let the operator drive. Modern phones send your location automatically when you call (AML), so the grid reference you read out is confirmation, not the only lifeline. But rescue teams still work from grid references, and a clear one saves minutes: square letters, then six figures, digits read one at a time, repeated back. Our grid tools show yours in one tap and keep working offline once loaded.
Call first — the reference comes second
The sequence matters: make the call before anything else (999/112 in the UK and Ireland — ask for police, then mountain rescue; 111 in New Zealand). While you talk, your phone is probably already helping: Advanced Mobile Location fires automatically on modern handsets and hands the operator a satellite fix. The reference you read out confirms it, catches the cases where AML didn't arrive, and gives the team a coordinate in the language their maps speak. If there's no signal, move to try for one — even a failed call can log useful data — and in the UK you can text 999 if you've registered in advance.
What rescue teams actually want
Teams navigate on gridded 1:25,000/1:50,000 mapping, so the native format is the grid reference: in Britain, two letters + six figures (NN 166 712); in Ireland, one letter + six figures (J 337 740); in New Zealand, NZTM figures or a Topo50 sheet + six figures (BP34 891 013). Read it slowly: letters first, then each digit singly — "three-eight-seven… one-four-eight" — and have the operator repeat it back. Add what you can see: a lake to the south, a wall line, the path you left. Position plus description beats either alone.
Grid reference vs what3words vs plain GPS
Rescue services take all of them, and each has real strengths and real failure modes. what3words is easy to say aloud, but it's a proprietary lookup and similar-sounding word triples have misrouted callers — controllers habitually cross-check it. Latitude/longitude is universal, but dictating long decimals invites transposed-digit errors, and the several formats (decimal, DMS) get mixed up mid-call. Grid references are map-native, short, and printed on the team's own sheets — but they need the letters to be unambiguous. The honest answer: give whatever you can read right now, clearly; a confidently read reference in any format beats a fumbled one in the "best" format.
Set yourself up before you need it
The five-minute version of preparedness: load the grid page for your country once at home so it's cached for offline hills; learn the six-figure drill so a paper map is enough when the battery dies; carry the map and know your rough square before things go wrong; and keep the emergency location page in mind for the urban and roadside cases where an address or coordinates serve better than a grid square. Print the free grid reference card (PDF) — romer scales, the read-out drill and the emergency numbers on one sheet for your map case. None of it weighs anything, and all of it shortens the worst phone call you'll ever make.