Deck General · EPIRBs & Distress Signals
A Category I EPIRB differs from a Category II EPIRB in that a Category I EPIRB:
- ATransmits on 121.5 MHz rather than 406 MHz
- BAutomatically activates and floats free when the vessel sinks✓ Correct
- CMust be manually activated and carried to a survival craft
- DRequires an annual hydrostatic test by the manufacturer
Explanation
A Category I EPIRB is mounted in a float-free bracket fitted with an HRU. When the vessel sinks to a certain depth, the HRU releases the EPIRB, which floats to the surface and activates automatically. A Category II EPIRB must be manually activated.
Authority: 46 CFR
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