OUPV & 100-Ton Master · EPIRB — Category I vs II
The difference between a Category I and a Category II 406 MHz EPIRB is that Category I:
- AIs float-free and automatically activated by a hydrostatic release; Category II is manually deployed✓ Correct
- BTransmits on 121.5 MHz only
- CIs for aircraft, not vessels
- DDoes not need registration
Explanation
A Category I EPIRB is mounted in a float-free bracket with a hydrostatic release, so it deploys and activates automatically if the vessel sinks. A Category II is manually released and activated. Both transmit a registered 406 MHz distress signal to the Cospas-Sarsat satellite system.
Authority: 47 CFR / Cospas-Sarsat; 406 MHz EPIRB standards
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