Hey Dark Noon
What they have done is shut down...or made unavailable shore based AIS services that were here to fore available on the web at places like
Want to know where are the ships now? Just key in any ship's name to see its position on AIS map.
shipsnow.com
or
MarineTraffic Live Ships Map. Discover information and vessel positions for vessels around the world. Search the MarineTraffic ships database of more than 550000 active and decommissioned vessels. Search for popular ships globally. Find locations of ports and ships using the near Real Time ships...
www.marinetraffic.com
if you look at the sites you see everything along the coast of mainland China is tagged sat-ais. The ais data is still there but not for anyone other than a subscriber to the satellite service ais data which for example is available here
MarineTraffic Online Services. Simple, powerful and effective tools tailored to your needs. MarineTraffic Online Services enable you to monitor, review, analyse and plan shipping operations. Whether you need information for a vessel, a port or at the global level, there’s a service to match your...
www.marinetraffic.com
so by and large the shore based ais transponder receivers from the Chinese mainland are no longer available on the internet like those are from across the strait in Taiwan. The sat-ais markers indicate those ships close to mainland China shore have activated ais transponders. Could there be ships there that have been instructed by the Chinese government to shut their ais transponders off?? Absolutely. Then you wouldnt see them at all anywhere except on a skin paint radar. Its the Chinese receivers that are no longer commonly available on the web. Given the high density of traffic alongshore I feel sure that ais shore based receivers are still operating....for traffic managers along the strait and elsewhere. The shore based data isnt any longer available on the web though.
Regards