The attribute table of the layer contains a pipeline identifier field called ‘PL_No’, a pipeline operator field called ‘Operator’ (representing the operator in May 2016) and 40 fields relating to the number of fishing tracks in each polygon according to year and gear type. The ‘AllGear’ field shows the total number of fishing tracks per polygon over the nine-year period. The ‘AllDredge’, ‘AllNep’ and ‘AllDem’ fields show the total number of fishing tracks over the nine-year period for vessels operating dredges, Nephrops trawls and demersal trawls respectively. The number of tracks for each year is given in the remaining fields for each gear category with field names showing ‘AllGear’, ‘Dredge’, ‘Nep’ or ‘Dem’ to represent gear type (all gear types, dredging, Nephrops trawling and demersal trawling respectively) and a two-digit year code representing the years between 2007 and 2015.