Open Government Licence (OGL)

This layer shows Marine Environmental High Risk Areas (MEHRAs). MEHRAs are "... to inform [ships'] Masters of areas where there is a real prospect of a problem arising. This prime purpose stands alone and regardless of any consequential defensive measures", and resulted from the Safer Ships, Cleaner Sea recommendations of the Donaldson inquiry. The areas are noted in Notice to Mariners (NtM) 26 and the 2006 Report "Establishment of Marine Environmental High Risk Areas (MEHRAs) - Protection of United Kingdom Waters from Pollution from Ships".

This layer shows the IMO marine pollution prevention measures under International Convention for the Prevention of Pollution from Ships (MARPOL) including special areas and particularly sensitive sea areas (PSSA).

Traffic separation schemes and other ship routing systems have now been established in most of the major congested, shipping areas of the world, and the number of collisions and groundings has often been dramatically reduced. The IMO's responsibility for ships' routing is enshrined in SOLAS Chapter V, which recognizes the Organization as the only international body for establishing such systems. This layer shows IMO traffic routing measures in Scottish waters including Traffic Separation Schemes (TSS), recommended routes, deep water routes, area(s) to be avoided (ATBA) and precautionary area.

This layer was created from IMO documentation (sources named in layer).

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.