WHITEPAPER

False Positions at Sea: Distinguishing AIS Spoofing from GNSS Interference

This analysis separates deliberate vessel-level AIS spoofing from area-wide GNSS interference, and uses Kpler's sanctions data on 910 vessels to show how spoofing works as an early risk signal within a wider vessel profile.

Not every false position at sea is a red flag. GNSS interference now affects whole regions, while deliberate AIS spoofing is a vessel-level act, and the two can produce near-identical tracks. Treating them alike risks turning a regional disruption into a compliance accusation, or missing genuine concealment.

Drawing on over 900 sanctioned vessels from 2025 to 2026, this whitepaper sets out how to distinguish the two.

Key takeaways

  • Attribution comes first. Regional GNSS interference and deliberate AIS spoofing can look identical, so respond to the evidence of cause, not the abnormal track.
  • Corroborate beyond GNSS. Onboard systems often share one bad input. Escalate only as far as independent evidence supports.
  • Spoofing is an early signal, not proof. It preceded designation in 36.3% of sanctioned vessels in Kpler's sample, often alongside other deceptive behaviour.
False Positions at Sea: Distinguishing AIS Spoofing from GNSS Interference

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