How to signal for help
- 1Try to call first — 911 or a satellite messenger if you have signal or a device.
- 2Signal in threes — three whistle blasts, repeated, and keep it up periodically.
- 3Use your mirror in daylight — flash sunlight toward any searchers, aircraft, or distant people.
- 4Make big ground signals — a large X or SOS in an open area, as big and high-contrast as possible, for aircraft.
- 5Use light at night — flashlight SOS (three short, three long, three short) or three flashes.
- 6Build signal fires if safe — three in a triangle; smoke by day, flame by night, only where fire is safe and allowed.
- 7Stay visible and put — bright colors, open or high ground, and if lost, stay where you are so searchers can find you.
The signals
- Whistle — three short blasts, repeated; carries far (about a mile in still air), works when your voice is gone, weighs nothing. Carry one.
- Signal mirror — reflect sunlight toward searchers or aircraft; visible for miles on a clear day.
- Ground-to-air — a big X ("need help") or SOS in a clearing, bigger and higher-contrast is better.
- Light & fire — flashlight SOS at night; three fires in a triangle; smoke by day, flame by night.
Common mistakes & safety
- Signal early and keep signaling — start before you're desperate, and repeat; searchers may pass within range only briefly.
- A whistle is a safety essential — carry one (it's why many packs and PFDs have one); three blasts is the call for help.
- Stay put if you're lost — signaling works best from one visible spot; wandering makes you harder to find.
- Fire signals must be safe — only where fire is allowed and controllable; never start a wildfire trying to be found.
- Plan communications before you go — a PLB or satellite messenger and a filed trip plan are what get help coming when 911 can't.
Going deeper
- Three of anything means help. Whistle, fire, or flash — three, repeated, is the universal distress call. Learn it and you can signal with almost anything.
- The whistle beats your voice. It's louder, carries farther, and never gets hoarse — three short blasts, over and over.
- Big, bright, and different. Rescuers find what stands out — get to open ground, wear bright colors, and make signals as large and high-contrast as you can.
Official source
Emergency Preparedness merit badge — Scouting America →This is general survival-signaling knowledge — confirm against the Emergency Preparedness / Wilderness Survival merit badges or an authoritative survival reference. Distance figures are approximate and vary with conditions.