Racon
A radar transponder that replies to a received radar pulse with a coded signal identifying its location.
General Nautical Terminology
Understanding the language of the marine world is like trying to learn a pirate’s secret code while juggling fish. You’ll wonder why a “sheet” isn’t something you sleep under but a rope that controls a sail. “Bowsprit” sounds like a sneeze, “booby hatch” isn’t a bird’s hideout, and “port” doesn’t come in a glass—it’s just left. If someone yells, “Man overboard!” don’t ask which direction they swam. And heaven help you if you think “scuttlebutt” is gossip—well, actually, you’d be right about that one. By the time you’ve figured out that “head” means toilet and “galley” isn’t an alley with gourds, you’ve already been hit with a wave and lost your hat to the wind they call a “nor’easter.”
Let us explain why a sheet isn’t for your bed, why “heave ho” doesn’t mean throw up (most of the time), and why “dead reckoning” is surprisingly less ominous than it sounds.
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Radio Regulations
The international treaty rules governing use of the radio-frequency spectrum and satellite orbits. Maintained through the International Telecommunication Union, they allocate frequencies and set technical and operating provisions, including maritime services. National administrations implement and enforce them through licensing and domestic requirements.
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Raster Navigational Chart
A georeferenced digital image of a paper nautical chart. An RNC preserves the chart’s printed appearance but does not contain the same object-based data as a vector ENC. Display scale, edition, corrections and datum remain important, and zooming cannot add source detail.
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Numerical Weather Prediction
The calculation of future atmospheric conditions by solving physical equations in a computer model. Models assimilate observations and represent the atmosphere on a grid, producing forecasts of wind, pressure, precipitation and other variables. Resolution, initial conditions and model assumptions create uncertainty, so forecasts are interpreted alongside observations and ensembles.
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Offshore Wind
A wind blowing from the land toward the water. It can produce deceptively smooth water near shore while carrying small craft, inflatables or people away from land. Strength may increase beyond shelter, and returning upwind can become difficult.
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On-scene Coordinator
The person or unit designated to coordinate search-and-rescue activities within a specified search area. The coordinator implements the search action plan, organises participating units, maintains communications and reports to the rescue coordination centre or mission coordinator. The role does not remove each vessel master’s responsibility for safety.
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Overlapping Headsail
A headsail whose clew extends abaft the mast when set in its normal position. Genoas are typical overlapping headsails and use the overlap to provide additional sail area. They require clear sheeting leads and more handling through a tack than non-overlapping jibs.
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Peak Halyard
The halyard that raises and supports the outer or peak end of a gaff. It works with the throat halyard to set the gaff’s height and angle. Coordinated hauling and easing prevents the gaff twisting, binding or imposing uneven loads on the sail and mast.
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Performance Level
A defined degree of capability or reliability required from equipment, a system or a person. The applicable standard specifies how the level is measured and the conditions under which it applies. The phrase is context-dependent and should be accompanied by the governing rule, specification or training scheme.
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Pilot Book
A navigational publication providing practical coastal and harbour information to supplement charts. It may describe approaches, anchorages, hazards, facilities, local weather, regulations and tidal effects. Pilot books must be kept current with corrections and checked against official charts, notices and local directions.
If you belive the Earth is flat, you're about to fall of the end...
If you belive the Earth is flat, you're about to fall of the end...
