In Sunderland's case, her parents were able to determine that two of her EPIRBs had been activated manually.
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A yellow plastic EPIRB.
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Emergency Position Indicating Radio Beacons (EPIRB) are standard on large vessels, but personal, portable devices are not as widespread.
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PLBs and EPIRBs, cell phones and BlackBerries, and the new SPOT messenger technology have all made wilderness travel safer than ever.
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When activated, an EPIRB can send a distress signal to a satellite that relays the emergency to the relevant national service.
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The women later said that they chose not to activate the EPIRB because they never feared their lives were in imminent danger.
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Float-free EPIRB distress beacons that can activate automatically became compulsory on commercial fishing vessels from 1 January 2019.
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In the high-tech marine world of radar, EPIRB, GPS, and satellite surveillance, how could hundreds of enormous vessels just get swallowed up by the sea?