Abbreviation | General Nautical Terminology | Light Characteristic | Nautical Topics | Navigation | Signals & Communication
Group Light Characteristic
Uses numbers in brackets to show how many flashes or eclipses form each repeating group.
Nautical Topics
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Abbreviation | General Nautical Terminology | Light Characteristic | Nautical Topics | Navigation | Signals & Communication
Charted Light Colours
The standard colour codes are W for white, R for red, G for green, Bu for blue, Vi for violet, Y for yellow, Am for amber and Or for orange.
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Abbreviation | General Nautical Terminology | Light Characteristic | Nautical Topics | Navigation | Signals & Communication
Obscured Light Sector (Obscd)
An arc in which the light is not visible or is intentionally screened.
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Abbreviation | General Nautical Terminology | Light Characteristic | Nautical Topics | Navigation | Signals & Communication
Intensified Light Sector (Intens)
An arc in which the light is shown with greater luminous intensity than in adjacent sectors.
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Abbreviation | General Nautical Terminology | Light Characteristic | Nautical Topics | Navigation | Signals & Communication
Unintensified Light Sector (Unintens)
An arc in which the light has less intensity than its intensified sector.
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Position Approximate (PA)
The position of the charted feature is not accurately determined.
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Watertight
Constructed to prevent water passing through in either direction under the pressure for which the structure is designed. Watertight bulkheads, doors and hatches preserve subdivision only when closures, seals and surrounding structure are intact and correctly secured. The standard is stronger and more specific than ordinary weather resistance.
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Weather Deck
A deck exposed to the outside environment and capable of being subjected to rain, spray or boarding seas. Openings, vents, fittings and drainage on a weather deck must maintain the vessel’s required weathertight integrity. Loose equipment also needs securing against wind and vessel motion.
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Wet Locker
A ventilated locker intended for stowing wet clothing or equipment while allowing drainage. It separates damp gear from dry accommodation and should have a drain to a suitable point rather than an enclosed bilge. Ventilation, cleaning and secure stowage help prevent odour, corrosion and blocked drainage.
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Wind Triangle
A vector diagram combining a craft’s motion through the air with wind to determine its motion over the ground, or the reverse. The three vectors must use consistent direction, units, scale and time. In marine work an analogous construction combines boat speed through the water with tidal stream.
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...
