Our knowledge of trade routes and commercial shipping in the Late Middle Ages depends significantly on the home port and destinations that are registered in toll books and customs accounts of major ports of export such as Lübeck, Hamburg or London. These accounts differ significantly from each other. Whereas the Hanseatic accounts provide fragmentary evidence on skippers, merchants, commodities, and origin or destination of the ship, the customs accounts of London have often been praised for their detailed information. This article makes use of both types of customs accounts as it analyzes three parallel entries in the custom year 1480/81. The results show that – used together – both sources can provide new insights into trade in the North Sea and beyond.