6 Nautical Miles (6M) limit - Inshore waters adjacent to Scotland - Inshore Fishing (Scotland) Act 1984
The inshore fishing boundary - 6 miles from baselines - is defined in the Inshore Fishing (Scotland) Act 1984. Inshore waters, part of Territorial Waters (12 mile limit), form part of Scotland as defined in the Scotland Act 1998.
This is modified version from the UKHO Law of the Sea department data, available via https://www.gov.uk/guidance/inspire-portal-and-medin-bathymetry-data-archive-centre