In this infographic, the location and type of detained dredgers are shown by flag state of the respective ship, summarising the IHS Markit data available for the years 2015–19
Between 2015 and 2019, a total of 27 dredgers were detained globally. Four vessels were detained in 2015, eight in 2016, five in 2017, four in 2018, and six in 2019. Most of the vessels were trailing suction hopper dredgers (TSHDs) and grab dredgers, which correspond to those being among the most common dredger types.
Looking at the flag states of the vessels, for both Sierra Leone and Turkey, five detentions each were registered. However, the detentions for the Turkish flag were all from the same ship – a hopper that was detained in January, October, and November 2015 as well as in March and August 2016. The Sierra Leone-flagged vessels were two grab dredgers and two TSHDs, all working in Asia under Asian ship management.