Number of AIS signals out of China plunges for November

It became significantly harder to keep track of the number of ships in Chinese waters during November. The Financial Times reports the country has blocked a large number of signals from automatic identification systems.

Ships at major Chinese container hub the Port of Yantian. | Photo: Martin Pollard/Reuters/Ritzau Scanpix

Chinese authorities have reportedly blocked public access to the signals coming from automatic identification systems (AIS), which show the locations of vessels.

The move is a matter of national security, reports the Financial Times, citing no sources directly for the information.

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