GNSS, as the foundational technology of the LRIT system, furnishes crucial position information, enhancing maritime search and rescue capabilities and fortifying maritime security. The LRIT system utilizes GNSS and satellite communication technology to acquire the ship's position and time information. Subsequently, this data is transmitted to the data center designated by the flag state for storage and processing. The term “flag state” pertains to the country whose flag the ship flies, with the ship obligated to adhere to the international law and legal regulations of the flag state. China's BDS system, acknowledged by the IMO as a global radio navigation system, is set to be applied internationally, emerging as a significant source of LRIT system position data.