Question 31E2

A 406 MHz satellite EPIRB (Emergency Position Indicating Radio Beacon) is designed for distress alerting and location by satellite. * **D) Aural locator signal:** This is not a feature. EPIRBs use radio signals for both initial detection by satellites and for short-range homing by rescue forces. There is no audible signal emitted by an EPIRB for location purposes. * **A) 121.5 MHz emergency homing transmitter:** This is a crucial component. After the 406 MHz signal has alerted satellites and provided an initial position, the 121.5 MHz signal is used by search and rescue aircraft or vessels with direction-finding equipment to pinpoint the exact location of the EPIRB at close range. * **B) Emergency transmission on 406.025 MHz:** This is the primary distress frequency used by the EPIRB to transmit coded signals to the COSPAS-SARSAT satellite system, which then relays the alert to rescue coordination centers. * **C) Float-free release bracket:** Many marine EPIRBs are mounted in such brackets. This safety feature automatically releases the EPIRB from a sinking vessel, allowing it to float to the surface and activate, even if the crew cannot deploy it manually.