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NOTICE TO MARINERS

10 of 2010
GLA DIFFERENTIAL GLOBAL POSITIONING SYSTEM (DGPS) SERVICE 
DGPS RECAPITALISATION WORKS
Northern Lighthouse Board
Edinburgh, 1 of April 2010
Mariners are advised that the replacement and upgrading of the General Lighthouse Authorities’ DGPS service will now be completed by December 2010, and not by April 2010 as previously advised in NOTICE TO MARINERS NO 17 OF 2009 (DATED 30 APRIL 2009).

This upgrading will allow differential corrections to be transmitted for future GNSS and additional signals from existing GNSS. There will be no changes to the broadcast parameters (frequency, range etc.). The upgraded service will remain unencrypted and therefore free to users with appropriate receivers.

The following DGPS broadcast stations will now be upgraded by December 2010: 
England & WalesFlamborough Head
Point Lynas
North Foreland
St Catherine's
Nash Point
Lizard
Wormleighton
ScotlandGirdle Ness
Stirling
Butt of Lewis
Sumburgh Head
IrelandTory Island
Loop Head
Mizen Head

The programme of work has been designed to ensure no disruption of the service to users. Individual stations will be taken off air for periods during this programme. However, adjacent stations will not be off air at the same time, thereby allowing the overlapping coverage of the system to provide continued service within the coverage area.

Broadcast station site specific works will be advised by use of a Radio Navigation Warning at least 48 hours prior to the commencement of works. Notification will also be broadcast by message 16 from adjacent DGPS stations. 
R G LOCKWOOD
Chief Executive
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