What is a RECCO detector?

The RECCO detector

(a small strip of metal integrated into clothing and gear) emits a radar signal, like the beam of a flashlight. When the radar signal hits the RECCO reflector, it is sent back to the detector and points the rescuer in the direction of the victim. The closer the detector gets to the reflector the stronger the returned-signal, ultimately allowing the rescuer to pinpoint the victim’s location. It has helped to save lives in backcountry accidents. Black Diamond, MEC,

Arc’teryx and many other brands integrate RECCO tabs in their shell garments.