Indicative polygons showing the statutory limits of harbour authorities around Scotland, including competent harbour authorities with responsibilities under the Pilotage Act 1987. The dataset generally uses S57 attributes for fieldnames, see http://www.s-57.com/ for more details. The dataset is derived from a number of sources (listed in attributes) and likely to be incomplete. The boundary polygons are intended for illustrative purposes and are not legally definitive.
The layers provide information on the intensity of mobile fishing associated with Oil and Gas pipelines and cables. Each layer was created by calculating the total number of fishing tracks in 1 km by 1 km squares along the length of each pipeline for four gear categories (see Rouse et al 2017). Fishing tracks were recreated for UK vessels greater than 15 m in length between 2007-2015 operating mobile demersal gear (otter trawls, pair trawls, beam trawlers and dredges) using vessel position data extracted from the Vessel Monitoring System. The layers can be used to aid the pipeline decommissioning process, including assessing the potential impacts and risks of different decommissioning options to commercial fisheries and informing the frequency of post-decommissioning monitoring according to level of fisheries interaction. The layers can also inform risk modelling for operational pipelines.