The 121.5/243 MHz frequency pair is associated with which EPIRB feature?

• A. Float-Fix
• B. Float-free
• C. Manually activated
• D. Satellite-based detection

Answer: (A)

The 121.5/243 MHz pair is the classic homing signal used to help rescuers locate an EPIRB on scene. After the alert is received, this near-field channel lets search-and-rescue teams home in on the beacon’s exact location, effectively providing a radio “fix” of where the beacon is. That’s why this pairing is associated with the Float-Fix feature: it emphasizes the on-site, radiolocation aspect of finding the beacon once a rough location has been established. The satellite-based detection role is served by the 406 MHz channel, not 121.5/243, and manual activation or float-free vs float-fixed pertains to deployment and whether the beacon detaches or remains mounted, which aren’t about the 121.5/243 homing signals.