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(contents )(mt) Marine Technology (ISSN 2153-4721) is published quarterly in January, April, July, and October by the Society of Naval Architects and Marine Eng ineers, 601 Pavonia Avenue, Jersey City, NJ 07306. Periodicals postage paid at Jersey City, NJ and additional mailing o ces. Annual subscription rates: For U.S. and possessions, $120 ; single copy, $35. For international: $135; single copy, $35. Copyright © 2013 by the Society of Naval Architects and Marine Engineers. POSTMASTER: Send address changes to the Society of Naval Architects and Marine Engineers, 601 Pavonia Avenue, Jersey City, NJ 0 7306. January 2013 www.sname.org/sname/mt [] [] A publication of the Society of Naval Architects and Marine Engineers www.sname.org BREAKING BARRIERSHow the Nordic maritime sector has evolved, adapted, and innovated Mission Flexibility Converting icebreakers Vessel Report Statoils Bit Viking Transition in Denmark From shipbuilding to technical innovation January 2013 ON THE COVER: Fugros Geo Coral , a seismic survey vessel built in Bergen, Norway and delivered in August 2010, uses the latest recording system, SEAL 428 from Sercel, which enables continuous recording of seismic data. Photo courtesy Fugro USA. COVER DESIGN BY BATES CREATIVE GROUP Icebreaker Innovation BY TERO VAURASTE Mitigating environmental risks through the conversion of icebreaking vessels New C-Class Additions BY MARTIN HARTLAND Fugro pushes the envelope on seismic survey ships Fresh Approach BY ERLEND HOVLAND AND ANDERS K. K. ATTRAMADAL Ensuring t-for-purpose rigs on the Norwegian Continental Shelf Vessel Report: Bit Viking Speci cations and particulars on a Swedish product tanker converted to lique ed natural gas fuel Propulsor Evolution BY MARKUS NIEMI Increased maneuverability and improved fuel e ciency are key parts of the azimuth propulsor equation The Onboard DC Grid BY JAN FREDRIK HANSEN, JOHN OLAV LINDTJØRN, TOR ARNE MYKLEBUST, AND KLAUS VANSKA New design for marine power and propulsion systems From the Editorial Board Feature Contributors Industry Events Policy Brie? ng Marine Technology Notes Travel In Review Education Abstracts Glossary Historical Note January 2013 CORRECTION e artwork of the clipper ship, Sovereign of the Seas , shown in Historical Note on page 87 of the October 2012 issue, was provided to (mt) by the San Francisco History Center, San Francisco Public Library.