Know where you went. Find your way back.
You don't need to be a surveyor. Start at the entrance, walk the cave, and come out with the whole trip: your route, your photos, how deep you went and how long you were down.
Any iPhone on iOS 26. No signal, no account needed.
What it does
When something goes wrong
Tap the red star and Rescue starts: stand at the injured caver, tap Patient here, and SpeleoMap records the way out for the rescue team. At the entrance, the 911 card has the GPS, the depth and the distance to the patient, ready to read out.
Your route, and what you saw
Your route, recorded.
Start a Cave Line at the entrance and walk. SpeleoMap draws your route in 3D as you go. Crawl ahead? Stow the phone in a chest rig, a bib pocket or a snug strapped pack and Stow Mode keeps the line going with the motion sensors.
Mark what you saw.
Drop a station at a formation, a squeeze, a pit or a junction. Add a photo, a short video or a note. Everything stays on its spot, so next time you know exactly where that column was.
Find your way back
Lock the entrance GPS and north, and the map shows you on every line from that entrance. Tap Go, pick the entrance or any station, and follow the route along the way you came in. Stray off the line and the phone buzzes; come back and it buzzes again.
The trip, after the trip
Distance, time underground, max depth and a movement breakdown (walking, stooping, crawling) land in your trip summary, and the workout saves to Apple Health. Share the map with your crew over AirDrop before you leave the parking lot.