Vortexa sees no upturn in tankers going ‘dark’ to ship Russian oil 8 April 2022 AIS switch-offs in Baltic and Black Sea fell in March, analytics platform saysAuthor: Capt. Johnhttps://www.tradewindsnews.com/tankers/vortexa-sees-no-upturn-in-tankers-going-dark-to-ship-russian-oil/2-1-1199810