This report describes the operation of the Charles Darwin Cruise CD174, BGS Project 05/05, carried out during August and early September 2005, as part of the Mapping European Seabed Habitats (MESH) survey off the west coast of Scotland. The area surveyed was in UK and Irish waters and lies between 55° 50’ and 57° 50’ North and between 8° and 14° West. This work was planned to integrate with existing UK, Irish and French multibeam data and also with multibeam data collected July-August 2005 during the UK Department of Trade and Industry (DTI) Strategic Environmental Assessment Surveys (SEAS) in the Rockall Trough.\ud The first week was focused on subsea structures in shallower waters and utilised surface tow sparker and boomer. The following three weeks were in much deeper water using BGS airgun and the EM12 swath bathymetry system mounted on the RRS Charles Darwin. Some of the work was in Irish waters, thus allowing the Irish and British datasets to be joined together at the median line. Gravity and magnetic data were also collected, with UKORS LaCoste and Romberg S40 marine gravity meter and BGS L&R S75 marine gravity meter, allowing comparison between the two meters at sea
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