Gps News

A new MIT-developed search-and-rescue algorithm identifies hidden “traps” in ocean waters. The method may help quickly identify regions where objects — and missing people — may have converged. Image courtesy of the researchers/

Tech Talk: Algorithm Aims to Assist Ocean Search and Rescue

modeling and prediction systems, forecasting the ocean’s behavior and currents, and used the TRAPS algorithm to map out strongly attracting regions over the course of the experiment. The researchers let the objects drift freely with the currents for a few hours, and recorded their positions via GPS trackers, before retrieving the objects at the end of the day.“With the GPS trackers, we could see where everything was going, in real-time,” Peacock says. “So we laid out this initial, widespread pattern of the drifters, and saw that, in the end, they converged on these traps.&rdquo

Sonardyne’s SPRINT-Nav hybrid inertial navigation instrument will be integrated into the SEA-KIT to improve navigation in challenging environments. (Photo: Sonardyne)

Sonardyne Tests Autonomous Vehicles Navigation for UK MOD

, Sonardyne tested and validated sensors already used by unmanned underwater vehicles for use on USVs in support of missions in coastal watersSpecifically, Sonardyne’s SPRINT-Nav hybrid inertial navigation instrument was integrated into a SEA-KIT X and tested against local real-time kinematic (RTK) GPS positioning, as part of the DASA program to fast-track autonomous vehicle capability in challenging or harsh conditions.Loss of satellite-based timing signals needed for navigation and positioning can occur in ports and harbors around tall structures or close to cliffs or inside fjords, where GPS

AutoNaut now has 10 of its wave propelled vehicles.Image: AutoNaut

Drill Rig Noise: Entering the Exclusion Zone, Quietly

40 and 60m deep on its towed array. The project focused towards the east of the MODU, due to the ongoing seismic survey to the northwest, and each system had its own tracking systems monitored by situation awareness package from ION. In total, more than 117 hours of continuous valid data, including audio, GPS and AIS, was gathered.Handling a buoy from the standby vessel. Image: AutoNaut“For operations of the AutoNaut outside the exclusion zone, lines were pre-determined with AutoNaut autonomously following; whilst remote pilots in the UK maintained a constant watch in the event of intervention, or

(Image: MetOcean Telematics )

New Drifter Buoy Tracks Water Currents

MetOcean Telematics has developed the STOKES Iridium tracking drifter, a compact drifting buoy designed and tested in technical partnership with Florida State University (FSU) that tracks water currents at the surface.The small light-weight buoy is equipped with Iridium satellite telemetry, GPS positioning and a sea surface temperature sensor. Iridium satellite telemetry enables the buoy to provide vital sensor and geo-positional location data in real time. Iridium also allows the buoy to have bi-directional capabilities. This is a critical ability, for example, if the buoy enters a region of interest

Image: SubSeaSail

SubSeaSail G6 Platform Passes the Test

the G6 platform to detect explosive compounds in the water. Additionally, a water quality sensor was mounted to monitor other water quality parameters including temperature, salinity, depth, and turbidity.  During the demonstration, the G6 platform was remotely sailed or guided through a programmed GPS waypoint trajectory. This allowed ERDC researchers to safely complete waypoint navigation missions in study areas. Dr. Guilherme Lotufo and Justin Wilkens from the Environmental Lab at ERDC stated, “The SubSeaSail G6 platform has proven to be a great tool for safely monitoring underwater munitions

Armed and ready: an Ecotone Underwater Hyperspectral Imager, or UHI, attached to an ROV (top) and stand-alone. Photo: Courtesy Ecotone

Pipeline IMR: An All-seeing Eye

recommended practice code for subsea pipeline repair. It covers fittings like clamps, couplings, T-branch connections and isolation plugs, including the welded connections of these.That’s where Ecotone can help: by scanning miles of connections, en masse, and then storing the descriptive data with GPS positions. DNV GL standards, service specifications and recommended practices might then be used to quickly assess the overall bill. Hence the writer’s assertion that this UHI system looks like it’ll be capable of speeding compliance on best practices for subsea pipelines.Just the startThe

Photo courtesy of GlobalStar

Drifter Buoys Aid Seaweed Research

the dramatic increase of Sargassum seaweed across the North Atlantic.The relatively harmless Sargassum has started washing up in areas including the Caribbean and the southeast U.S. in such huge quantities that it is killing coral, impacting fishing and forcing the closure of beaches. By analyzing the GPS data transmitted from SPOT Trace trackers, researchers from the NIOZ Royal Netherlands Institute for Sea Research, The University of Amsterdam (UvA) and Utrecht University aim to understand where the free-floating, kelp-like algae originates and how its environment is changing, so that action can

(Photo: Maddie Hunt Photography
/ Armstrong Marine)

Research Vessel Delivered to Orca Maritime

, head with shower, refrigerator/freezer, and 600-gallon fuel capacity.Benthic Cat is powered by twin Volvo Penta D11 510hp inboards paired with Volvo IPS 650 propulsors and Volvo electric steering. Builder sea trials indicated 32mph cruise and 37mph top speeds. The dynamic positioning system integrates GPS navigation data with propulsion controls to automatically maintain heading and position. Joystick controls at the aft docking station and flybridge station ease handling.(Photo: Maddie Hunt Photography / Armstrong Marine)Deck equipment includes the A-frame with Pullmaster PL5 hydraulic winch, a Morgan

A REMUS vehicle shows the traditional four element DVL array (Photo Courtesy Hydroid)

ADCPs & DVLs: Recent Tech Developments

, especially DVLs, for undersea vehicles. One of the most common unmanned undersea vehicles in service is Hydroid’s REMUS. This vehicle typically employs Teledyne’s compact DVL in the original configuration of four transducers mounted in a ring. The DVLs in these vehicles augment the GPS positions, recorded at the surface, and often inertial motion measurements to assist the vehicle in tracking its position for improved “dead reckoning.”The four transducer array is not the only configuration for a DVL, nor UUVs the only beneficiary. Another configuration is a phased array

NotiloPlus’ Seasam AUV has been operating around the world. Photo from NotiloPlus.

Subsea Tech's 'March of Miniaturization'

it can offer a whole system for the same price as a single sensor. “We’re opening a new market, giving mini-ROVs new tool to do advanced navigation that’s not been done before,” says Skisland.At the Tau event, Water Linked’s positioning system was used as an “underwater GPS” on Oceaneering’s Freedom 60% scale Freedom AUV test vehicle. There, with four what the company calls receivers on the docking station and a “locator” on the vehicle, it provided 1cm-accuracy for the AUV to dock into a subsea docking station. An optimal scenario would see the

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