Sea Technology

JUL 2018

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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Page 27 of 44 July 2018 | ST 27 a growing need for the establishment of a future VDES satellite component to offer potential enhancements to maritime safety, including the GMDSS, and expand the system from coastal areas to global coverage. Hence, fur- ther research is essential, including the mobile-satellite service reallocation and the consideration of the poten- tial impact of possible modifications to the provisions of the Radio Regulations on sharing and compatibility with other services and systems in the VHF maritime frequen- cy band and adjacent frequency bands. The VDES will have a very important role in improving communications to enhance maritime capabilities and supporting the strategy implementation plan for e-navi- gation. References For a list of references, contact Sanjin Valcic at sval ST Dr. Sanjin Valcic an assistant professor working as a postdoctoral researcher at the University of Rijeka, faculty of maritime studies. He researches mar- itime electronic communication and navigation systems. He received his Ph.D. in 2016, with research on maritime VHF data exchange. Dr. Srdan Zuskin is an assistant professor at the University of Rijeka, faculty of maritime studies, researching the correlation of maritime transport ele- ments in maritime traffic, including ECDIS, maritime education and training standards and navigational information systems. Dr. David Brcic researches maritime navigation and information systems, cartography and satellite navigation. He is an assistant professor at the Uni- versity of Rijeka, faculty of maritime studies. and broadcast aspects of the VDES. Moreover, the route exchange could also take the advantage of the addressed and broadcast aspects of the VDES. In this way, the route exchange could enhance safety by providing early indi- cation of changes in route that may be due to fatigue, weather conditions or condition of the vessel (malfunc- tion). Logistical elements where the VDES may be an appro- priate communication method include: transfer of vessel loading plan, tug operations, pilotage operations, stores/ supplies/ship bunkers, and waste removal. Conclusion The ITU has developed the technical characteristics of the VDES, which integrates AIS, ASM and VDE, using the timing and frame structure of the AIS. The AIS channels are primarily used for the surveillance and the safety of navigation purposes in ship-to-ship use, ship reporting and vessel traffic services applications, while its other currently used applications are deployed onto the new channels. The VDES is an adaptive system, depending on the propagation characteristics and mode of operation, and can achieve 32 times higher data rate when compared to AIS. These technical characteristics were accepted at WRC-15, and Appendix 18 of the ITU's Radio Regulations was revised in order to allocate the frequency spectrum for the terrestrial component of the VDES. When consid- ering the implementation aspects of the VDES there is 1953 County Street, East Taunton MA 02718 USA (800)822-4744 or (508)822-7330 / Email: / Channel Buoy Remove the water with the help of a JW Fishers Side Scan So nar! - Low cost - 500' depth capability - Single or dual frequency towfish - Up to 2,000' (600m) range per side of the towfish - Displays sonar images on a laptop or tablet - Simple to operate - "Turn key" system - Store files (XTF format)

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