Notice To Mariners

Region D


NOTICE TO MARINERS No.64 /07 B23, C24, D11, E8 , F8, G10 ----------------------------------------------- eLORAN TRANSMISSIONS ------------------------------------

Further to Trinity House Notice to Mariners No.46/07 dated 5th September, 2007. The General Lighthouse Authorities are establishing a new Enhanced Loran (eLoran) station in Cumbria, UK (coordinates: Latitude 54° 54' 40.35'' N. Longitude 3° 17' 14.21'' W). System verification and calibration started on 1 October 2007 and is due to be completed on or around 21 December 2007. The broadcast signal will be °blinked° meaning that user receivers should not use the signal. The station will be declared fully operational on or around 15 January 2008 when the °blink° will be removed so that user receivers can use the signal. Existing Loran receivers may require software upgrades from their equipment suppliers to use the new signal. The signals from Cumbria will be pulsed, with a Group Repetition Interval (GRI) of 6731Y (67,310°s) and the Emission Delay (ED) of the system is 27300°s. The signals will be modulated with Eurofix data messages with the facility to broadcast differential GPS, differential Loran, integrity information and Universal Co-ordinated Time parameters. Maritime Users are strongly encouraged to use LORAN as a navigational input system to back-up the widespread use of GPS. All radio navigation systems are susceptible to interference (including jamming) and environmental effects, which can adversely affect their availability. The GLAs strongly advise that no single aids to navigation system should be used in isolation and that users should use all alternative means available to cross check the information received. The General Lighthouse Authorities are committed to the future of eLORAN as offering a terrestrial radionavigation system without the vulnerability to interference of GPS, and are keen to hear feedback from the user community on the performance of eLORAN. By Order Captain D. Glass, Director of Navigational Requirements. Trinity House, London EC3N 4DH, 21st December, 2007.

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