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An intergovernmental research institute and operational service producing global numerical weather predictions and Earth-system data. ECMWF provides deterministic and ensemble analyses and forecasts from medium-range through sub-seasonal and seasonal timescales, maintains a major meteorological archive and supports European Copernicus services. Model output is not itself a marine warning or guaranteed local forecast. Users should consider…
The Met Office’s high-resolution limited-area numerical weather prediction configuration centred on the United Kingdom and Ireland. UKV uses a fine inner grid with a coarser outer domain and boundary conditions from the Met Office global model. It resolves coastlines, terrain and some convective processes in greater detail than a global model. Higher resolution does not…
The United Nations specialised agency coordinating international cooperation in weather, climate, operational hydrology and related environmental observations and services. WMO establishes technical frameworks for observing, exchanging and using data and supports warning, forecasting and capacity-building through its member states and territories. National services remain responsible for their operational forecasts and warnings. Its maritime work includes…
The United Kingdom’s national meteorological service, providing weather and climate science, observations, forecasts and warnings. Its marine services include the Shipping Forecast, gale warnings, inshore-waters forecasts, strong-wind information and specialist products for government, defence, transport and industry. Forecasts describe expected conditions and uncertainty rather than guaranteeing local weather at a vessel. Mariners should combine the…
Four coverage-based areas—A1, A2, A3 and A4—used to determine GMDSS radiocommunication carriage and alerting arrangements. A1 is within continuous VHF DSC coverage of a coast station; A2 extends beyond A1 within continuous MF DSC coverage; A3 lies beyond A1 and A2 within recognised mobile-satellite service coverage; A4 is the remaining area. They are not a…
A standardised set of English phrases for safety-related ship-to-ship, ship-to-shore and onboard communication. The IMO adopted the SMCP to reduce misunderstanding across language barriers. It covers routine navigation, pilotage, berthing and onboard operations as well as distress, urgency and emergency situations. The phrases support clear communication but do not replace competent English, correct radio procedure…
A mooring buoy connected to a low-impact anchoring system designed to avoid routine chain scouring of sensitive seabed habitat. Designs may use elastic or floating rode sections, helical anchors or other components that keep ground tackle off seagrass, coral or vulnerable substrate while supporting the intended vessel loads. “Eco” does not guarantee zero impact or…
The international rules governing vessel conduct, lookout, safe speed, collision avoidance and navigation lights, shapes and sound signals. The 1972 COLREG Convention and its annexes apply on the high seas and connected waters navigable by seagoing vessels, with national implementation and permitted special local rules. They define vessel statuses and responsibilities in sight, restricted visibility…
The four-stage process used to develop, carry out and continuously check a passage plan. Appraisal gathers relevant information and assesses risks; planning converts it into a detailed berth-to-berth route and contingencies; execution manages the voyage; monitoring checks the vessel’s progress and the continuing validity of the plan. The stages interact rather than forming a one-way…
One of two shortened two-hour watches traditionally scheduled from 16:00–18:00 and 18:00–20:00. Splitting the normal four-hour period creates an odd number of watches in the day, allowing personnel in a traditional watch system to rotate rather than keeping the same hours every day. The periods are often called the first and last dog watches. Modern…
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