British Geological Survey (BGS) Geophysical Survey 1974/6: SW Approaches (Area between 50N and 52N) (26/04/1974 to 24/06/1974)

Report: Davies, AJ, Mould, AS, Roberts, PR. & Kimber, PD. 1974. Geophysical Surveys in the Celtic Sea Area, MV Briarthorn. MGU Project 74/06. (IGS Report No 52, WB/MG/74/52) Navigation: Decca Main Chain. Equipment: EG&G 9 element spark array with Bolt and Geomechanique hydrophone systems and Huntec recorder. Transit Sonar MS 47. Ship echo-sounder.