Dubei class target ship (AGT) and range supporting vessel is a very little known auxiliary ship of the People's Liberation Army Navy (PLAN), and has received the NATO reporting name Dubei class. Originally built as a SWATH test platform, it was subsequently converted to a target ship by adding radar reflectors and other electronic equipment to simulate various targets in support of anti-ship weaponry development, but is still capable of housing different scientific instruments to perform various research tasks, and thus also acts as general purpose research ship (AGE). With the exception of the very first unit of this class, ships of this class in PLAN service are designated by a combination of two Chinese characters followed by two-digit number. For the environmental research version, the second Chinese character is Ba (靶), meaning Target in Chinese, since from the second unit onward, this class is primarily used as target ship and range support vessels. The first Chinese character denotes which fleet the ship is service with, with East (Dong, 东) for East Sea Fleet (ESF), North (Bei, 北) for North Sea Fleet (NSF), and South (Nan, 南) for South Sea Fleet (SSF). However, their designations may have changed due to the change of Chinese naval ships naming convention or when newly completed units are assigned to different tasks in the future. The first unit is designated as Shi-Yan 216, or 试验 216 in Chinese, meaning Experiment 216, indicating in addition to range support and targeting missions, it also performs other scientific research tasks. The exact details of Experiment 216 remain mostly unknown as of 2022, because Chinese authorities have not released any specific information. Specification: Length: 35 meter References Ships built in China Naval ships of the People's Republic of China Auxiliary ships of the People's Liberation Army Navy Military catamarans Small waterplane area twin hull vessels