The extended outlooks are issued once a day, at 2300, GMT and cover the next 3 to 5 days.
The waters around the British Isles are divided into 3 areas shown on the map; these areas reflect the coverage areas of the UK′s Navtex transmitters, with overlaps as appropriate.
The forecast contains details of the likelihood of gales or storms, a general synopsis and a general forecast for the area of coverage of each Navtex transmitter.
The marine forecasts guide has more information about how to view the forecasts, including a glossary of terms used and the Beaufort scale.
Last updated: 20 June 2013