406-MHz station in the mobile no apparent distress pdf service used in search and rescue operations. EPIRB is the terminology used for such devices in the marine environment.
Distress alerts transmitted from EPIRBs are received and processed by the International Cospas-Sarsat Programme. EPIRBs are tracking transmitters which aid in the detection and location of boats, aircraft, and people in distress. EPIRB that is typically smaller, has a shorter battery life and unlike a proper EPIRB is registered to a person rather than a vessel.
EPIRB only when used on aircraft. Transmitters broadcasting on 406 MHz are recognized. When manually activated, or automatically activated upon immersion or impact, such beacons send out a distress signal.