The M-S4 is a mid-range GNSS signal generation module offering expanded frequency coverage with 7, 13, or 18 configurable frequency points across GPS, BDS, GLONASS, Galileo, and QZSS. It supports position, velocity, and time spoofing to achieve directional diversion, forced landing, crash induction, and no-fly enforcement. The module is compact, field-ready, and compliant with China's National Radio Administration technical standards.