The disappearance of ships in Chinese waters, from the industry's tracking systems, is creating a headache for the global supply chain, creating a growing distrust of foreign influence. At the end of October, analysts began to notice the drop in maritime traffic as China prepared to enact legislation that addresses data privacy. Using an automatic identification system or AIS transceiver, shipping data companies track ships around the world. Through high frequency radio, ships can send information about their position, speed, heading and name to stations which are located along the coast. According to shipping data by Vessels Value, 90% of this has plummeted in the world's second-largest economy, being critical in trade. Charlotte Cook, chief business analyst at Vassel Value commented that she is seeing industry-wide downsizing of terrestrial AIS signals in China.