Marine director Tom Boardley says the shutdowns are a persistent problem after tightening emissions limits that went into place in January, even though the UK classification society and its competitors have sent advisories about proper fuel management.

“They [port authorities] are effectively concerned that effectively, you have an unguided missile in your port, and also these blackouts occur at the worst possible moment,” he told TradeWinds on the sidelines of the Connecticut Maritime Association’s Shipping 2015 conference.