Category

Nautical Dictionary

A glossary of maritime terms.

Tanker Management Self Assessment (TMSA)): A self-evaluation tool designed specifically for tanker operators. The TMSA allows companies to assess their current compliance with international tanker safety regulations. For instance, a tanker operator could use the TMSA to evaluate their vessel's readiness for an oil cargo transfer operation. This self-assessment process ultimately helps companies maintain a...
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The transom frame or plate refers to the horizontal structural member situated beneath the aftmost part of a ship, commonly known as the counter. This frame plays a crucial role in supporting the counter and reinforcing the overall structure of the ship. For instance, during the construction process of a sailing vessel, the shipwrights would...
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The Open Reporting System (ORS) is a set of guidelines and standards for reporting data related to maritime operations. The ORS is designed to promote transparency, interoperability, and data quality in maritime reporting. For instance, a marine traffic control center might use the ORS to collect and report vessel position data, speed data, and other...
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SHEX stands for Sundays and Holidays Excluded. This term is used to indicate that certain days or holidays are not included in a particular schedule or agreement. For example, in a charter agreement for a yacht, the SHEX clause would specify which Sundays and holidays are excluded from the charter period.
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After frames are nautical structures composed of cant frames that radiate outward from the transom plates, which are located at the stern of the vessel. For instance, during the repair or reconstruction of a ship's transom, the after frames would be an essential component to maintain the vessel's structural integrity and stability. For example, while...
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A ship chandler is an individual or business that specializes in the sale of necessary equipment and provisions for the efficient operation of a ship. For example, a captain of a cargo ship docked at a port may require a ship chandler to supply him with various provisions such as fresh water, foodstuffs, and spare...
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The National Cargo Bureau (NCB) is an independent organization responsible for overseeing the safe handling, packing, and stowage of cargo aboard vessels. For instance, when a large consignment of dangerous goods is being transported by sea, the ship's owners would engage the NCB to ensure that all the necessary precautions are taken during the loading,...
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Ozone Depleting Substances, commonly referred to as ODS, are a group of synthetic chemicals that significantly contribute to the depletion of the Earth's ozone layer. These substances contain chlorine or bromine atoms, which become reactive in the ozone layer and catalyze the destruction of ozone molecules. An example of how ODS might be used in...
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A messenger line is a light and flexible rope employed for transferring the load from one rope or cable to a stronger one during hauling operations. For instance, when pulling a heavy anchor up from the ocean floor, a messenger line can be used to initially lift the anchor's chain or shackle, making it easier...
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The term bow lines refers to the curves representing a vertical section of the bow end of a ship. It is important to note that similar curves found in the aft part of the hull are referred to as buttock lines. For instance, during the mooring process, the sailor must secure the bow lines to...
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