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Marine Electronics


October 2014 Issue

SeaTrack Neptune Integrated Into SeaRobotics USVs
SeeByte (Edinburgh, Scotland) and SeaRobotics (Palm Beach Gardens, Florida) have integrated SeeByteís SeeTrack Neptune with SeaRoboticsí family of general purpose USVs as part of a Defence Research and Development Canada contract.

SeeTrack Neptune provides a payload control architecture and real-time autonomy engine for unmanned systems to plan and execute well-known patterns of behavior that expedite and optimize single-vehicle and multivehicle operations.

The SeaRobotics USV-2600, a 4-meter, general-purpose USV, can be used for numerous applications and is able to accommodate specific designs.

This integration will enable the USV to act as a relay to a UUV squad. This is an important step to enable over-the- horizon UUV operations.

Swedish Sub Rescue Vessel Gets NASDive Upgrade
Nautronix (Aberdeen, Scotland) has commissioned the largest NASDive digital diver communications system (Sea Technology, May 2014) for an up- grade of the communication system on board the submarine rescue vessel MV Belos for the Swedish Navy. The vessel is fitted with hyperbaric chambers to facilitate rescue of submariners in the event of an incident. It was recently on an exercise with the NATO Submarine Rescue system.

Following that exercise, the chamber system upgrade took place, including a full upgrade of the chamber communications system to NASDive. This involved communications to eight individual locations in each of four chambers, two further locations in each of five locks and transfer chambers, plus an additional nine external communications locations, making for a total of 51 individual locations.

NASDive digitizes all speech at source, which eliminates many problems associated with signal losses in cabling and connectors, resulting in clear communications at all times. It also has improved unscramble algorithms and helium speech unscrambling. System cabling is simplified by the use of CAT5 cabling to each location, or, if unavailable, VDSL on screen twisted pairs would be used, both of which allow standard telecoms hard- ware to be used topside. Ethernet hubs are used to marshal the signals, and control of the system is provided via a touch-screen display and control unit.

UK Police Conduct Searches With SeaKing Hammerhead
Yorkshire and the Humber Police areas, through their regional underwater search and marine unit, have been using the Tritech (Aberdeen, Scotland) SeaKing Hammerhead system to locate missing persons. The system was recently deployed at Snailsden Reservoir, in the peak district, South Yorkshire, England, where it enabled the team to quickly locate the body of a missing person who was believed to have drowned.

Prior to deployment of the sonar, the area was mapped using Tritechís StarFish 990F, a high-resolution side scan sonar system, to ensure the safety of divers entering the waterway; ultimately reducing the amount of time they had to be in the water, making the operation safer.

The SeaKing Hammerhead sonar provides 360° scans of the search area, and a georeferenced plotter display and a built-in compass ensures accurate marking and mapping. It can be operated in two frequencies: 675 kilohertz for large area survey up to a radius of 100 meters, and 935 kilohertz for high-definition target examination up to 40 meters radius.

Volvo Penta IPS Engines Power Patrol Boat
Thomas Paine, the new 50-foot aluminum patrol boat that joined the Massachusetts Environmental Police fleet in July, is the first commercial vessel in North America to be powered by Volvo Penta (Chesapeake, Virginia) IPS propulsion.

Built by MetalCraft Marine Inc. (Cape Vincent, New York), the vessel is equipped with twin Volvo Penta D11 510-horsepower marine diesel engines driving IPS650 steerable drive units. Power Products, the Volvo Penta Power Center in New England, was responsible for supplying the propulsion system and overseeing installation.

The Volvo Penta IPS consists of a steerable underwater drive unit with two forward-facing counter-rotating propellers. The drive units pull the boat rather than pushing it through the water, thereby increasing efficiency.

LISST-Deep to Monitor Fjords For Particle Distribution
Det Norske Veritas (DNV), based in Høvik, Norway, has taken delivery of a LISST-Deep laser particle sizer to be applied for oil, gas and mining industry-related monitoring. This insitu-capable instrument was procured through MacArtney Underwater Technology (Esbjerg, Denmark) and marks the first LISST sale by the company in its newly minted role as exclusive representative of Sequoia Scientificís (Bellevue, Washington) LISST products in Denmark, Norway, Sweden, Finland and Iceland. The LISST-Deep for DNV was delivered as a complete turnkey solution with external battery package and on-site training.

The LISST-Deep will initially be deployed by DNV to monitor the ecological effects related to the deposition of tailings into the marine environment, specifically deep-sea tailing in fjords in Norway.

An area of special interest is natural flocculation and the fate of particles when entering a fjord. While large particles will settle first, finer particles will drift with the current and spend a longer time settling and spreading out. These finer particles hold a substantial potential as a carrier of mining industry-related pollution, as heavy metals can settle on the particle surface and be carried far from the emission outlet.

In addition to gravity and current distribution, fine particles will form flocs that will affect and change particle distribution. DNV knows that this flocculation behavior is important for the distribution of the tailings, but requires more information on what will happen with the distribution of tailings in relation to particle size from the source point and out in the fjord environment.

The LISST-Deep is best known for its role after the Deepwater Horizon accident in April 2010, where it was deployed to detect oil droplets and their size in the deep waters of the Gulf of Mexico.


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