Moreover, seafarers can get MSI data delivered by satellite communications and even download weather information from the internet. The relevant maritime meteorological data are also disseminated by means of Coastguard voice transmissions, in the shape of the Maritime Safety Information (MSI) broadcasts. Furthermore, there are many NAVTEX and HF Narrow Band Direct Printing (NBDP) transmissions containing weather updates. In the British Isles, this includes, of course, BBC Radio Four’s Shipping Forecast on long wave ( 198kHz). According to these rules, weather information is delivered in different formats, including by means of broadcast radio. The Safety of Life at Sea (SOLAS) regulations of the International Maritime Organisation (IMO) entered into force in 1980. There is one piece of important information all vessels at sea require, be they large cruise ships carrying three thousand or more passengers, a super-tanker, a trawler or even a small day boat – all of them need up-to-date and reliable, weather information. Robert Connolly explains DRM weather ‘datacasting’ to ships, revisits the RTTY transmission mode and looks at synoptic weather forecasts, before diving into the fascinating history of the Shipping Forecast.
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