What are the two different frequencies used by EPIRBs?

The correct frequencies used by Emergency Position Indicating Radio Beacons (EPIRBs) are 121.5 MHz and 406 MHz. The 406 MHz frequency is utilized for distress signaling and is monitored by satellite systems, such as COSPAS-SARSAT, allowing for precise location determination and quick response. The 121.5 MHz frequency, on the other hand, is primarily used for search and rescue operations; it is an older frequency that is still monitored by aircraft and other search and rescue teams.

This dual frequency capability enhances the effectiveness of EPIRBs in emergency situations, ensuring that signals can be received and acted upon by both satellite systems and local rescue units. The transition from solely relying on 121.5 MHz to incorporating 406 MHz represents an evolution in maritime safety technology, increasing the reliability and accuracy of distress signals.