High usage rate. According to the inquiry, the usage rate of drones in Zhenjiang is very high. Zhenjiang, formerly known as Jingkou, Runzhou and Nanxun, is a prefecture-level city under the jurisdiction of Jiangsu Province, one of the 27 cities in the central area of the Yangtze River Delta, and an important port and scenic tourist city in the Yangtze River Delta of China approved by the State Council.