Oil tankers off Iran show up in rural Russia as tracking signals jammed

One of them, the Front Eagle, a sister ship of the Front Tyne, and like it, more than three football pitches long, appeared to be onshore in Iran on June 15, data from commodity data platform Kpler showed.

"There is usually no jamming in the Strait of Hormuz and now there is a lot,” said Ami Daniel, chief executive of Windward.

"The culmination of all that is higher risk. It's a hot area... if you don't geolocate, there's a bigger chance you'll have an accident."

Ships are required to indicate their location and are fitted with transmitters similar to GPS called an AIS, or Automatic Identification System, that send regular signals on location, speed and other data. Jamming disrupts these signals.