“Iran’s ability to turn its tankers truly into ghost-ships will be more limited,” said Richard Nephew, former deputy coordinator for sanctions policy at the U.S. State Department. On a typical day last year, Iran exported some 2.2 million barrels a day of crude. U.S. officials have said their new ban is intended to stop every barrel of Iranian oil leaving the country. For that strategy to work, authorities are likely to rely on information from companies like Tel-Aviv-based Windward Ltd. Windward, along with firms such as U.S.-incorporated TankerTrackers.com and Paris-based Kayrros, track suspicious movements as part of a broader effort to assess global oil supplies. For example, in September, Windward said its technology detected a tanker leaving an Iranian port and turning off its radio signal, it was followed by two other tankers that also turned off their radio transmitters. Days later, Windward said, the ships returned to Iran, […]