Core Viewpoint - The article addresses the navigation signal anomalies in Nanjing on December 17, 2025, clarifying the technical reasons behind the issue and emphasizing the strategic significance of the BeiDou system in relation to GPS [2][3]. Group 1: Navigation Signal Anomaly - The core reason for the navigation failure was temporary interference suppressing GNSS satellite signals (including BeiDou and GPS), rather than a network signal interruption [2]. - Offline maps cannot resolve the navigation anomaly as they only store geographic data and do not replace the need for positioning signals from satellites [2]. - The interference specifically targeted the civilian frequency bands of BeiDou and GPS, leading to issues such as position drift and lack of data feedback, making effective navigation impossible [2]. Group 2: Strategic Significance of BeiDou and GPS Compatibility - The simultaneous impact on both BeiDou and GPS signals during the anomaly validates the forward-looking strategic vision of China's BeiDou system's civilian frequency planning [3]. - The compatibility of BeiDou's civilian signal (B1C band) with GPS's civilian signal (L1C band) breaks the spectrum resource blockade and creates a strategic balance where interference with BeiDou also affects GPS [3]. - This design serves as a deterrent against malicious interference, as any disruption to BeiDou's civilian signals will also impact GPS applications, thereby enhancing the security of civilian navigation services in China [3]. Group 3: Military Frequency Resilience - The signal anomaly only affected civilian GNSS frequency bands, while BeiDou's military frequencies remained unaffected [4]. - BeiDou employs a military-civilian frequency separation design, ensuring that military frequencies are isolated from civilian bands [4]. - The military system incorporates advanced anti-jamming technologies, providing strong resilience against interference and ensuring reliable time-space services for national defense and critical areas [4]. Group 4: Conclusion and Future Actions - If the navigation anomaly was a result of temporary signal control measures for major event security, it is considered a routine safety protocol within the industry [5]. - The Nanjing Satellite Application Industry Association will continue to monitor industry dynamics and share professional knowledge on satellite navigation technology to enhance public understanding [5]. - The association aims to build a communication bridge between enterprises and the government, encouraging active participation from relevant companies [5].