An ongoing disruption of Automatic Identification System (AIS) data is causing severe issues for dozens of vessels, mostly tankers, in Russia’s far east, specifically in Nakhodka Bay. This interference, which began on August 6, 2025, has made it impossible to track the ships’ activities using AIS alone.
What’s Causing the Disruption?
The problem stems from the disruption and manipulation of Global Navigation Satellite System (GNSS) receivers. AIS systems rely on GNSS for position information, and when the satellite signal is interfered with, false data is received. While GNSS interference is common in conflict zones, and Russia has previously used it to target Ukrainian weapons systems in other regions, the motive in Nakhodka Bay is believed to be different.
Hiding Oil Exports and Skirting Sanctions
Analysts suggest the most likely explanation for the interference is a deliberate attempt to obscure the loading of oil. By making it difficult to track tankers, Russia may be trying to prevent non-sanctioned vessels from being identified and potentially targeted by Western authorities. However, this strategy is double-edged. As one analyst noted, such AIS anomalies actually make a vessel more likely to be sanctioned, not less. The area has already been a hub for sanctions-skirting activities, with tankers previously tracked conducting “dark ship-to-ship transfers” in the bay.
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Source: Lloyd’s List
