Meaconing is a sophisticated form of signal manipulation in which legitimate GNSS signals are captured, delayed, and rebroadcast from another location. Unlike spoofing, the attacker does not generate counterfeit satellite signals—they retransmit genuine ones with a controlled delay.Because the signals remain authentic, traditional GNSS receivers often accept them as valid. The result is an incorrect position or timing solution that can be difficult to detect without an independent verification source.For commercial vessels, meaconing can cause gradual position offsets, navigation errors, and degraded situational awareness while appearing to operate normally.