From Iran to China to Venezuela - how seized tanker hid location

Under a UN treaty, all ships above a certain tonnage must have an onboard tracker called an Automatic Identification System (AIS). These trackers broadcast information about the ships, including their location, and can be followed on websites like MarineTraffic.

But there is an incomplete and misleading public record of the Skipper's movements. According to MarineTraffic, the Skipper's last known port call was at Soroosh in Iran on 9 July, where it arrived after stopping in Iraq and the UAE.

But Kpler suggests that this is part of a pattern of misleading entries by the Skipper. Analysts at the firm said the ship had previously loaded crude oil from Venezuela and Iran, while falsifying its position via its onboard tracker, a process known as spoofing.