To enhance the positioning accuracy of ships, reduce positioning errors, and support precise maritime operations such as wharf lifting, channel dredging, marine surveying, ship berthing, submarine pipeline laying, and offshore drilling platform construction, China's coastal navigation guarantees have long relied on the RBN-DGNSS for high-precision navigation and positioning services. This system has established a comprehensive differential GNSS navigation service network, covering coastal ports, critical water bodies, and waterways from the mouth of the Yalu River to the North Sea. Within the network's coverage area, users can receive differential corrections broadcasted by the reference stations. These corrections are used to refine the GNSS observations from the user's receiver, thereby improving positioning accuracy.