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www.sea-technology.com May 2016 / st 5 The Worldwide Information Leader for Marine Business, Science & Engineering SEA TECHNOLOGY® ©Copyright 2016 by Compass Publications, Inc. Sea Technology (ISSN 0093-3651) is published monthly by Compass Publications, Inc., Suite 1010, 1600 Wilson Blvd., Arlington, VA 22209; (703) 524-3136; FAX (703) 841-0852. All rights reserved. Neither this publication nor any part of it may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior permission of Compass Publications Inc. Periodicals postage paid at Arlington, Virginia, and additional mailing offces. Subscrip- tions may be purchased at the following rates: domestic, $60 one year; $80 two years; foreign air mail, $133. Single copies $4.50 plus shipping and handling (current issue only). POSTMASTER: send address changes to Compass Publications, Inc., P.O. 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Editorial .......................................................7 Soundings ...................................................9 Capital Report ...........................................45 Ocean Business .........................................46 International ..............................................48 Offshore Oil & Ocean Engineering ............50 Navy Currents ...........................................51 Product Development ...............................52 Marine Electronics .....................................54 Marine Resources ......................................56 Marine Renewables ...................................57 Environmental Monitoring .........................58 Ocean Research ........................................60 Contracts ...................................................61 Meetings ...................................................62 People .......................................................63 ST Looks Back ...........................................64 Soapbox ....................................................65 Professional Services Directory ..................66 Advertiser Index ........................................70 COVER — A hybrid AUV/ROV with optical and acoustic communication methods in use at NASA's Neutral Buoyancy Lab (NBL) in Houston, Texas, with a replica of the International Space Station in the background. (Photo Credit: Sonardyne International Ltd.) NEXT MONTH — NOIA Annual Meeting review. ... Eliminating preventable damage to subsurface infrastruc- ture in the Gulf of Mexico and straits of Florida. ... Side scan sonar for acoustic detection, evaluation and monitoring of sunken oil spills. ... SmartICE project www.benthos.com NEW! R2K Mid-Column Acoustic Release NEW! UTS-9400 Universal Top Side Discover Teledyne Benthos' NEW family of acoustic release technology – reliable, rugged and ready for your next deployment! NEW! Pre-Deployment Acoustic Release Tester IMAGING • INSTRUMENTS • INTERCONNECT • SEISMIC • VEHICLES GO GREEN! May 2016, Volume 57, No. 5 Visit our website at www.sea-technology.com for online versions of feature articles and news departments. The editorial staff can be contacted at oceanbiz@sea-technology.com. 10 A NEW KIND OF HUNT Steve Werblow (freelancer) discusses the use of CastAway CTDs to gather data under the Hudson Bay ice. 13 US GOVERNMENT FISCAL YEAR 2017 BUDGET Sea Technology's annual review of the president's budget takes a look at funding for various ocean-related agencies. 17 UNDERSEA DEFENCE TECHNOLOGY — Conference Preview 19 BETTER COMMUNICATION AT SEA Romain Butet (MVG) looks at the NeptuLink modem and how it enables high-speed Internet to vessels while at sea. 23 CLEAN PACIFIC — Conference Preview 25 INDUCTIVELY COUPLED UNDERWATER DATA TRANSMISSION SYSTEM Zhang Xiaowei, Deng Yun and Jiang Fei (China's National Ocean Technology Center) present their test results for real-time monitoring of marine and freshwater environments. 27 UNDERWATER SURVEY OF HISTORIC US NAVY SEAPLANE Dr. Hans Van Tilburg (NOAA) reveals details of the Catalina PBY-5 lost in the attack on Pearl Harbor December 7, 1941. 31 MODERN TOWED SYSTEMS Christian Haag, Christian Dreyschultze (Mariscope) and Raúl A. C. González (National University of Comahue) discuss new developments and applications for multipurpose platforms. 35 AUTONOMOUS USV OBSTACLE AVOIDANCE Peng Wu, Dr. Shaorong Xie and Hengli Liu (Shanghai University) present their fndings on solving problems of the defects of the APF algorithm and sensor errors. 37 ACCURACY COMPARISON OF ONLINE GNSS PPP Dr. Reha Metin Alkan (Istanbul Technical University), Î. Murat Ozulu and Veli Îlçi (Hitit University) discuss their study analyzing Web positioning services' performance in marine environments. 41 DEVELOPMENT OF MODULAR USVS FOR COASTAL ZONE MONITORING Dr. Enrico Simetti, Dr. Sandro Torelli and Alessandro Sperindé (DIBRIS, University of Genova) look at two new USVs that will be used to monitor geophysical and environmental parameters.