The Automatic Identification System known as AIS is a ship broadcast system that is used to track the movement of ships at sea and can be readily spoofed to obfuscate travel. It can be shut off to cover up illegal trade like ship to ship cargo transfers for shipping to sanctioned countries. This "going dark" is a common practice with Russian ships that transport Ukranian grain from occupied territory to Turkey and Egypt. Maritime travel is replete with information from the AIS that can give a ship's IMO number which can then aide in identifying the ship or be spoofed as well so that a ship can appear to be another ship.

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