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92 O ceanology International is one of the largest trade fairs in the world for ocean technology and maritime engineering. The third running of the event in London, in March, drew more than 500 organisations from 79 countries, with dozens of USVs, UUVs and aquatic components showcased at the ExCeL exhibition and conference centre. Hydroid, a subsidiary of Kongsberg Maritime, unveiled its new micro-AUV system, the Remus M3V. Duane Fotheringham said, “It is designed as an A-size [36 x 4.875 in] vehicle. It has sidescan transducers for imaging surveys and a doppler velocity log for navigation faired inside the hull, beneath acoustically transparent windows. It can operate as a normal AUV in a ‘swim’ mode for surveying, or it can transition into a buoy thanks to its adjustable centre of gravity.” The buoy mode allows the 10 kg AUV to dive with its nose down, keeping its antennas above the surface while its acoustic systems remain under the water. Acoustic surveying and comms can thus continue while data is transmitted in real time back to the operator over a wi-fi or Iridium data link. This mode also allows visual location using a flasher LED and GNSS reception. In swim mode the M3V has a top speed of more than 10 knots. It uses an articulated tail control system for manoeuvring, and is rated to a depth of 300 m. Silicon Sensing showcased its silicon MEMS inertial measurement units (IMUs), including its two newest products, the DMU30 and DMU11. The new systems incorporate six of the company’s resonating ring gyroscopes – three optimised for navigation performance and three for low noise and wider bandwidth – with an additional six capacitive MEMS accelerometers to complete the internal sensor suite, designed for integration into navigation, GNSS and AHRS systems. “Our systems perform comparably to fibre optic gyros, and have lower noise, better angular random walk and improved bias instability than similarly sized MEMS systems, thanks to the number of gyros and accelerometers Rory Jackson highlights some of the key marine innovations on display at this recent ocean technology exhibition Spring tide April/May 2018 | Unmanned Systems Technology The ocean-going Liquid Robotics Wave Glider USV was just one of the many unmanned and autonomous maritime systems to attract interest at the show (Courtesy of Oceanology International)