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NORBIT velocity 2014 For more Solutions visit 14 to be cost-effective. A dedicated survey ves- sel is expensive to operate, especially in rough and remote deep-sea environments where the ship must be large enough to ride out rough ocean weather and where a highly skilled crew and scientific staff may be lodged for days or weeks at a time. Multibeam sonars can transmit and receive a large number of 'pings' at once, thus covering a wide swath of seafloor in a single sweep. While being the instrument of choice in today's map- ping applications, to be most accurate, measure- ments must take into account the movement of the instruments on the surface of the water. tenna needs to be precisely measured—already done for you; and all sorts of cabling etc. needs to be run between all the different boxes—also taken care of. so from a simplicity point of view, there is much less that can go wrong with this system while still maintaining a very high de- gree of accuracy." Peter Koldgaard Eriksen is business Develop- ment Director at NorbiT subsea Us Ltd. His relationship with NovAtel goes back to his 'pre- vious life' within the industry, he says, with an- other company within the industry. since then he has kept NovAtel in his sights. "NorbiT knew what it wanted for the new Figure 3: Underwater canyons revealed. Figure 4: The iWBMSc in action. Horizontal and vertical positioning is generally measured using GNss receivers and iMUs. The iMUs need to be mounted very close to the trans- ducer to minimize any potential error due to the offset between them. The new NorbiT iWbMsc eliminates many of the problems associated with conventional multibeam sonar; because the sPAN system is completely integrated into the sonar unit, there is no additional error as when these units are mounted in different parts of the vessel. The system directly senses the motion of the sonar because it is actually a part of the sonar unit. Dixon describes the advantages: "The iMU needs to be precisely mounted—already done for you; the distance between the iMU and an- multibeam sonar system," he says. "We knew we needed GNss in our system, and we wanted something very compact. but we also knew that conventional motion sensors would not fit inside our unit. And on top of that, we were very price- sensitive." At various meetings and every single trade show, he says, "we could see what NovAtel was do- ing and it was very clear that we would eventually work with them on our new system; NovAtel was definitely on our road map." NorbiT understood the potential implica- tions of putting a small iMU inside their multi- beam sensor head, and like NovAtel they were re- ally just waiting for the right iMU to come along. When sensonor, based in Norway, created that 3 4 Photos courtesy of Subsea Norbit. Photos courtesy of Seahorse Geomatics.

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