The 406 MHz EPIRBs also transmit on what frequency?

• A. 121.5 MHz
• B. 406 MHz
• C. 2.4 GHz
• D. 5 GHz

Answer: (A)

Modern 406 MHz EPIRBs are built to both alert search-and-rescue satellites and aid rescuers in locating you on the ground. They broadcast a digital distress signal on 406 MHz that provides identification and position data to COSPAS-SARSAT. In addition, they continuously emit a homing signal on 121.5 MHz, which ground and air SAR teams use with direction-finding gear to pinpoint the beacon’s exact location once the initial alert is received. The other bands, like 2.4 GHz and 5 GHz, aren’t used for these distress beacons. So the frequency they also transmit on is 121.5 MHz.