Iran is concealing the destination of its oil sales by disabling tracking systems aboard its tanker fleet, making it difficult to assess how much crude Tehran is exporting as it seeks to counter Western sanctions aimed at cutting its oil revenues.

Most of Iran’s 39-strong fleet of tankers is now “off-radar” after Tehran ordered captains in the National Iranian Tanker Co (NITC) to switch off the black box transponders that are used in the shipping industry to monitor vessel movements, oil industry, trading and shipping sources said. (Reuters)