Abstract : This paper focuses on the design of the NTS(Navigation Test System) to verify the performance of the navigation system prior to mounting the navigation system, which is a key technology in the operation of UUV(Unmmaned Underwater Vehicles), to UUV. The developed NTS consists of 5 kinds of navigation sensors mounted on the UUV, a navigation system part with interface board and processor, a support part, parts installed on the test ship, and parts to control the height of the support. The developed NTS was installed on the test ship and the sensor data logging test was performed. The overall contents of this experiment are also included in this paper.