http://dailycaller.com/2018/09/21/iranian-oil-tankers-persian-gulf/

September is a steep learning curve as Iranian tankers are going to great extremes to hide their activities in the Gulf waters. A lot of the vessels remain offline, but we have learned a great deal now about their patterns and movements. Green=known. Red=awaiting ID. #OOTT #Iran pic.twitter.com/WL2WHHgVNW

— TankerTrackers.com