The 406 MHz distress signal in the GMDSS is associated with which system?

The 406 MHz distress signal in the GMDSS is associated with which system?

• A. COSPAS-SARSAT
• B. INMARSAT
• C. GPS
• D. NAVSTAR

Answer: (A)

406 MHz distress beacons are part of the COSPAS-SARSAT satellite-aided search and rescue network. When a beacon transmits on 406 MHz, it sends a digital identification payload that COSPAS-SARSAT satellites pick up and relay to ground stations and rescue coordination centers, enabling fast localization and alerting of the appropriate authorities. Inmarsat is a separate satellite communications system used for voice and data links, not the 406 MHz distress-alert network. GPS/NAVSTAR are navigation systems and do not handle distress signaling or SAR coordination.

406 MHz distress beacons are part of the COSPAS-SARSAT satellite-aided search and rescue network. When a beacon transmits on 406 MHz, it sends a digital identification payload that COSPAS-SARSAT satellites pick up and relay to ground stations and rescue coordination centers, enabling fast localization and alerting of the appropriate authorities. Inmarsat is a separate satellite communications system used for voice and data links, not the 406 MHz distress-alert network. GPS/NAVSTAR are navigation systems and do not handle distress signaling or SAR coordination.