Powerful, targeted jamming caused a temporary blackout of satellite navigation systems, including GPS and BeiDou, in a major Chinese city on Wednesday, an industry association said on Friday. The disruption affected users in Nanjing, a city of nearly 10 million people and capital of the eastern province of Jiangsu, between 4pm and 10pm on Wednesday. Car navigation, food delivery, ride-hailing, and drone control apps relying on satellite positioning experienced a “systemic anomaly” during the...