Blinking Morse code — using eyes, a flashlight, or any flashing light — is one of the most powerful survival and communication skills you can learn. Light travels farther than sound, requires no physical contact with a surface, and can be sent silently across vast distances.
Downed pilots have been rescued by flashing Morse with pocket mirrors. Sailors have signalled ships miles away with a flashlight. Prisoners have communicated through windows. This guide teaches you how.
The most practical tool. Press and release quickly for a dot, hold for 3× as long for a dash. Any pocket flashlight works — even the one on your phone.
Any reflective surface — a phone screen, foil, CD, or piece of glass — can reflect sunlight. Tilt into sun, aim at target, flash by covering and uncovering with your hand.
A quick blink = dot. A slow, held blink = dash. Used by people who are fully paralysed but conscious. Jeremiah Denton famously blinked T-O-R-T-U-R-E in Morse during a filmed interview as a POW in Vietnam.
Flash headlights or hazard lights in Morse patterns. Quick flash = dot, extended flash = dash. Useful for signalling in low-visibility conditions on roads or airstrips.
The same timing rules apply whether you're using a flashlight, mirror, or your eyes:
Key insight: In an emergency you don't need perfect timing. Rescuers and trained observers listen for the pattern. Three short flashes, three long flashes, three short flashes will be recognised as SOS even if your timing is imperfect.
Emergency tip: If you're ever lost or stranded, a simple pocket mirror is one of the highest-value survival tools you can carry. A signal mirror can attract attention from aircraft up to 16km away — far beyond the range of any voice or whistle.
Our Morse Code Translator has a built-in Light Signal mode — enable it and the screen flashes white for every dot and dash. Use it to practice reading and sending Morse by eye.
Open Translator — Enable Light Signal