What type of beacon operates on 406 MHz for satellite-based distress alerts?

• A. Satellite EPIRB (406 MHz)
• B. SART (Search and Rescue Transponder)
• C. NAVTEX receiver
• D. DSC transceiver

Answer: (A)

Beacons that use 406 MHz for satellite-based distress alerts are designed for global rescue via the COSPAS-SARSAT system. A satellite EPIRB transmits a unique identification and, if equipped, GPS coordinates to satellites, which relay the alert to rescue authorities. This is specifically what enables rapid, wide-area distress signaling from maritime users.

Other devices mentioned work differently: a SART responds to radar signals on a marine radar and doesn’t rely on satellites; a NAVTEX receiver picks up safety and weather messages on specialized low frequencies; a DSC transceiver handles digital distress calls over VHF/MF radio channels, not satellite-based messaging.