I don't know where you're getting your information, but it is WRONG. PLBs and EPIRBs transmit a SAR transponder signal on the 121.5 MHz band. It is used for directional location by SAR personnel.
From the ACR website, from one of their PLB pages:
Transmits on 406 MHz via the COSPAS-SARSAT satellite system with your registered, unique, digitally coded distress signal and 121.5 MHz (SAR homing frequency).
I think you're confusing the fact that 121.5 MHz EPIRBs have been discontinued and thinking it means that EPIRBs and PLBs don't broadcast on 121.5 MHz... which they do.
no PLB emits 121.5Mhz signal anymore.
in any case, response time to PLB is (many) hours, whereas someone overboard probably has a lot less, perhaps minutes depending on circumstances.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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