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The number of cargo ships and tankers going dark has surged in 2026, highlighting the limitations of relying on Automatic Identification System (AIS) data alone to monitor maritime activity.
Strait of Hormuz Automatic Identification System Kooh Mobarak Iranian Heavy Crude Prolonged Russia AIS-visible Congestion Deliberate Using Synthetic VLCC Iran Dalian China
Windward: Tracking dark vessels requires more than AIS
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