Clarksons Research is putting greater emphasis on tracking port congestion, as its figures showed one-third of the boxship fleet was tied up in terminals during April.
Analyst Trevor Crowe said inefficiencies in the supply chain had led to notable "disruption upside" for containerships, as well as bulkers, with rates at record levels in some markets.
Capturing the scope of disruption from port congestion is a challenge, he admitted.
