Which type EPIRB must each ocean-going OSV carry?

Correct Answer: Option D — Category I

46 CFR 133.130 requires ocean-going OSVs to carry a Category I EPIRB. Unlike other classes, a Category I EPIRB is designed to float free and activate automatically upon immersion, providing a 406 MHz signal to the Cospas-Sarsat satellite system for rapid detection and location by search and rescue authorities.