Definition
An EPIRB transmits a registered digital distress message on 406 MHz to the Cospas-Sarsat satellite constellation, together with a 121.5 MHz homing signal for final approach by rescue units. Most models include an internal GNSS receiver for immediate position accuracy, and modern units may also carry an AIS locating signal and return link indicator. Float-free versions release hydrostatically and operate for at least forty-eight hours.
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