Project: A2953 Client: East Anglia Offshore Wind Limited Title:
East Anglia THREE– Navigation Risk Assessment
www.anatec.com
27.2 Very high Frequency (VHF) Communications (including Digital Selective Calling (DSC))
424. As part of the 2004 trails at North Hoyle Wind Farm tests were undertaken by the MCA and QinetiQ to evaluate the operational use of typical small vessel VHF transceivers when operated close to windfarm structures.
425. The windfarm structures had no noticeable effect on voice communications within the windfarm or ashore. It was noted that if small vessel ship-to-ship and ship-to-shore communications were not affected significantly by the presence of wind turbines, then it is reasonable to assume that larger vessels, with higher powered and more efficient systems would also be unaffected.
426. During this trial a number of mobile telephone calls were made from ashore, within the windfarm, and on its seawards side. No effects were recorded using any system provider (MCA and QinetiQ 2004).
427. Furthermore, as part of 2005 SAR trials carried out at North Hoyle Wind Farm, radio checks were undertaken between the Sea King helicopter and both Holyhead and Liverpool Coastguards. The aircraft was positioned to the seaward side of the windfarm and communications were reported as very clear, with no apparent degradation of performance. Communications with the service vessel located within the windfarm were also fully satisfactory throughout trial. (MCA 2005)
428. Vessels operating in and around offshore windfarms have not noted any noticeable effects on VHF (including voice and DSC communications). No significant impact is anticipated at the East Anglia THREE windfarm and therefore has been scoped out of the EIA assessment.
27.3 VHF Direction Finding
429. During the 2004 trails at North Hoyle Offshore Wind Farm, the VHF direction equipment carried in the lifeboats did not function correctly when very close to turbines (within about 50 m). This is deemed to be a relatively small scale impact due to the limited use of VHF direction finding equipment and would not impact operational or SAR activities, especially as the effect is now recognised by the MCA (MCA and QinetiQ, 2004).
430. Throughout the 2005 SAR trials carried out at North Hoyle Wind Farm, the Sea King radio homer system was tested. The sea king radio homer system utilises the lateral displacement of a vertical bar on an instrument to indicate the sense of a target relative to the aircraft heading. With the aircraft and the target vessel within the windfarm, at a range of approximately 1nm, the homer system operated as expected with no apparent degradation
431. No significant impact has been noted at other sites and none are expected at the proposed East Anglia THREE project and therefore has been scoped out of the EIA assessment.
Date: Doc:
07.05.2014 A2539 East Anglia THREE Windfarm Appendix 15.1 Page: 175
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