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A comment on Black Tide in Brazil. Parent comment

Re:Black Tide in Brazil by schoen on Monday November 18, 2019 @12:22PM (#21566113)
Radar can detect ships that don't cooperate with it, but not identify them.

Ships are supposed to actively cooperate with a system called AIS (which is like aviation's ADS-B).

https://en.wikipedia.org/wiki/Automatic_identification_syste...

If they use AIS as required, they will be identified by receivers that they pass nearby.

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Re:Black Tide in Brazil by specialist on Tuesday November 19, 2019 @08:02AM (#21572476)
Surely there's a short list of usual suspects.

Process of elimination. List of all known ships (tankers). Rule out ships accounted for (alibis). Investigate the handful of rouges.

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