Foreign vessels entering Chinese waters — including much of the South China Sea — are now required to report their presence to authorities.

The Maritime Safety Administration of the People's Republic of China put in place rules at the start of the month mandating that certain types of foreign-flagged ships must contact it with identifying details when entering its waters.

Failure to do so could result in fines from CNY 50,000 ($7,743) to CNY 500,000 for owners, operators or managers and CNY 10,000 to CNY 30,000 for ship captains.