Power for marine professionals
largely to blame for the grounding of the cargo ship MCL Trader in the same year.
Motion detection Unsurprisingly, a specialist sector offering BNWAS technology has grown up around the industry in recent years, offering a variety of solutions to meet the specifications of the requirements. At its most basic, the principles of BNWAS are as follows: the systems’ purpose is to monitor activity on the bridge, to provide some sort of confirmation that the OOW is indeed active at his or her post, with each update to be provided in between three to 12 minutes. Once the BNWAS has been installed, it must be used whenever the vessel is offshore and, in some circumstances, while at anchor. Ultimately, this means a series of checks at regular
intervals, each authenticating that the OOW is present and compos mentis. Hence the incorporation
“We do meet some shipowners who are only focusing on price but this approach can lead to technical problems later on”
of motion sensor technology into the bulk of the most viable BNWAS offerings on the market. As Flemming Jensen, technical manager at Denmark-based Uni-Safe Electronics, which manufactures the DNV-approved BW-800 BNWAS, tells Ship & Boat International: “Obviously, if crew personnel are required to push a button manually every three minutes, to confirm that they are alright while undertaking OOW duties, this can impact on their ability to concentrate on navigation, which can in turn increase the likelihood of an accident occurring.” On a less severe level, Helen Taylor, marketing
manager at UK-based Martek Marine, which produces the Lloyd’s Register-classed Navgard BNWAS solution, says: “Having to punch a button at regular intervals is an irritation that crew members can do without, and can prove stressful in the long run.” As a result, a popular feature of most modern BNWAS
is the inclusion of motion sensor detectors, combining infrared and microwave detection to ensure that the OOW is physically active. Taylor likens most motion detection systems to an inverse of “home burglar
Ship & Boat International July/August 2011
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