Page 40: of Marine Technology Magazine (September 2012)

and has two DGPS, and a radius reference system. There is preparations for Kongsberg?s HiPAP 500 high precision acoustic positioning. The integrated automation system is supplied by Høglund Marine Automation. Arctic class Polarcus Adira is an Arctic-ready vessel designed and built for operations in Arctic waters carrying the ICE-1A* and Winterized Basic notations from Det Norske Veritas, the classi cation company of these vessels. Polarcus Adira can operate in  rst-year ice of up to 1 metre thickness without the assistance of icebreaker. The hull is ice-reinforced and the vessel has de-icing and ice-preventing systems at critical tanks, pipelines and systems, and the propellers, gears and thrusters are dimensioned for withstanding operations in ice. Escape corridors and rescue equipment are also protected against icing during Arctic operations. The hull form is not really icebreaking, why the intention is to do the work in open water. 3D seismic acquisition will only take place in ice-free water. The Arctic qualities of the vessel enables the vessel to relocate through ice to and from the survey area, or remain in icy areas waiting for the ice to clear, increasing the operational window of the vessel. Seismic equipmentPolarcus? worldwide service capabilities encompass conven- tional 3D surveys and sophisticated wide- and multi-azimuth projects, high-density 4D development surveys. Polarcus Adira is a 3D/4D 12-14 streamer seismic research vessel capable of deploying up to 14 Sercel Sentinel solid streamers. The naviga- tion system is ION Orca and the depth positioning system is of type ION DigiBIRD combined with DigiFIN lateral control and DigiRANGE acoustic ranging, supplied by ION Geophysical Corporation. The seismic air gun source is by Bolt Technology Photo credit Ulstein Group /Per Eide September 2012MTR #7 (34-49).indd 40MTR #7 (34-49).indd 409/10/2012 9:44:59 AM9/10/2012 9:44:59 AM