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  • An acoustic survey of the Durham Coast was carried out by SeaMap Research Group of the University of Newcastle-upon-Tyne (10-13 February 1998) using a vertical acoustic ground discrimination system, the RoxAnn. The area was surveyed using 3km long parallel tracks, 250m apart. Acoustic mapping using the RoxAnn system provides data on the physical nature of the sea bed - depth, roughness and hardness. The acoustic data have no biological meaning unless they are related to biological assemblages, determined from direct observations or samples of the sea bed at pre-determined point locations. Thus sub-tidal grab samples and video drops were taken within the survey area.