CP2 Regional Sea Boundaries: Northern North Sea, Offshore 1:250k: Bosies Bank, Bressay Bank, Caithness, Fair Isle, Fladen, Orkney, Peterhead, SeaVoX Sub-Ocean: NORTH SEA
Report: Armstrong, EJ. 1979. Cruise Report for Project 79/14, West Shetland and Project 79/15, Bosies Bank. (IGS Report No 101). The aim of Project 79/15 was completion of regional geophysical coverage of the Bosies Bank sheet, of the IGS 1:250000 map series, on a grid ot NS-EW lines at approximately 10km by 10km spacing. Early in leg 1 the deep tow boomer failed and was out of operation for two days. The sparker results obtained were of good quality, as were those from the deep tow boomer when it was redeployed. The deep tow boomer, 1kJ sparker, transit sonar and watergun were run on all lines in leg 2, until maintenance on the watergun necessitated replacing it with a 40 cu.in. airgun. Both the airgun and watergun achieved up to 0.7s penetration. Pinger results were generally inferior to the boomer except in good weather and so were not used on all lines.
Navigation: Magnavox satellite navigation system integrated with MX 610 doppler sonar. Decca Mk21 Main Chain. Equipment: Bolt 40, 20 and 10 cu.in. airguns. Huntec deep tow boomer. Atlas Deso 10 echo sounder with hull mounted transducer and digital readout unit (Edig 10). LaCoste & Romberg air-sea gravity meter S40 with Monitor Labs 9400 data acquisition system. Two Barringer magnetometers. Edo Western 248 pinger with hull mounted transducers. IGS multi-element spark array and EG&G 9 candle and 3 candle spark arrays. MS47 side scan sonar. Sodera 80 cu.in. watergun. Two 30m Geomechanique hydrophones and one 50m Geomechanique hydrophone. For more detailed information see the Cruise Report.
Airgun/Sleeve Gun, Deep Tow Boomer, Echo Sounder, Gravimeter, Magnetometer, Pinger, Sparker, Transit Sonar, Water Gun
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