Often it’s unclear whether going dark in this way is legal. Just as thieves can turn off phone location tracking, ships can disable their AIS transponders, effectively hiding their activities from oversight. Surveillance there is aided by location transponders, called the Automatic Identification System, or AIS, which works like the Find My iPhone app. The high seas are the modern world’s Wild West – a vast expanse of water far from oversight and authority, where outlaws engage in illegal activities like unauthorized fishing and human trafficking. Better information about how often boats go dark at sea can help governments figure out where and when these activities may be taking place.Ĭountries can combat illegal, unreported and unauthorized fishing by checking paperwork, verifying catches and sharing information across borders. It also has been linked to human rights violations, such as forced labor and human trafficking. Illegal fishing causes economic losses estimated at $US10 billion to $25 billion annually. And authorities like the International Maritime Organization can use this missing data to help combat illegal activities at sea, such as overfishing and exploiting workers on fishing boats. In a recent study, I worked with colleagues at Global Fishing Watch, a nonprofit that works to advance ocean governance by increasing transparency of human activity at sea, to show that these periods of missing transponder data actually contain useful information on where ships go and what they do. For the 19 hours when the ship was dark, no information was available about where it had gone or what it did. 11, the Oyang 77 turned its transponder back on and reappeared on the high seas. 10, the Oyang 77 turned off its location transponder at the edge of Argentina’s exclusive economic zone – a political boundary that divides Argentina’s national waters from international waters, or the high seas. The vessel had a known history of nefarious activities, including underreporting its catch and illegally dumping low-value fish to make room in its hold for more lucrative catch.Īt 2 a.m. In January 2019, the Korean-flagged fishing vessel Oyang 77 sailed south toward international waters off Argentina.
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