How is GPS spoofing different from jamming?

Spoofing sends fake but believable signals so the receiver computes a false position, while jamming simply blocks signals so the receiver gets no fix at all. Spoofing deceives; jamming denies.

Why is spoofing considered especially dangerous?

Because the receiver may treat counterfeit signals as genuine, the aircraft can report a confident but incorrect position. This can cause navigation discrepancies and false alerts that are harder to detect than an outright signal loss.

Navigation

GPS Spoofing

Also known as: GNSS spoofing

GPS spoofing is interference that transmits counterfeit satellite navigation signals to deceive an aircraft's receiver into computing a false position, velocity or time. Unlike jamming, which denies a fix, spoofing makes the receiver confidently report an incorrect location.

Reviewed by AeroVigil GNSS Monitoring Desk · 2026-05-31

A spoofer broadcasts signals that mimic genuine GNSS transmissions but encode false data. Because the navigation system may accept these signals as authentic, spoofing can be more insidious than jamming: rather than failing visibly, the aircraft's systems may report a plausible but wrong position, which can trigger erroneous alerts, navigation discrepancies and increased crew workload.

Spoofing of civil aircraft has been increasingly reported in and around contested regions in recent years. Aviation safety bodies have warned about its operational effects, including conflicts between satellite-derived and inertial position data and the cascading effects on time-dependent avionics. Crews are trained to cross-check GNSS against independent sources when interference is suspected.

Spoofing is a security-driven airspace signal that frequently appears alongside jamming. AeroVigil captures interference reports and advisories and maps them to affected regions and routes, helping operations and security teams understand where navigation integrity may be degraded.

Frequently asked

How is GPS spoofing different from jamming?: Spoofing sends fake but believable signals so the receiver computes a false position, while jamming simply blocks signals so the receiver gets no fix at all. Spoofing deceives; jamming denies.
Why is spoofing considered especially dangerous?: Because the receiver may treat counterfeit signals as genuine, the aircraft can report a confident but incorrect position. This can cause navigation discrepancies and false alerts that are harder to detect than an outright signal loss.

Related terms

Sources

EASA Safety Information Bulletin 2022-02 — GNSS Outage and Alterations
EUROCONTROL — GNSS interference reporting guidance