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An enclosed section of a waterway in which the water level is changed to transfer vessels between different levels. A chamber is closed by gates and filled or emptied through sluices, culverts or pumps until its level matches the waterway ahead. Locks range from manually operated canal structures to large controlled systems for ships, and…
An enclosed or partly enclosed compartment used to store equipment, supplies or personal belongings aboard. Lockers may be located on deck, under seats or bunks, in the cockpit or within machinery and accommodation spaces. Their name often reflects purpose or position, such as chain locker, gas locker, wet locker or cockpit locker, and those specialised…
A chronological record of a vessel’s operations, navigation and significant events. Entries can include time, position, course, speed, weather, sea state, engine or sail changes, watch handovers, communications, drills, defects, incidents and persons aboard. The required content and retention depend on vessel type, flag, company and voyage; a private craft’s passage log may be less…
The continuous watch maintained by sight, hearing and all appropriate available means to detect and assess relevant hazards. A lookout may be a specifically assigned person or a duty shared within a watch, depending on vessel, conditions and applicable requirements. The task includes detecting vessels, lights, shapes, sound signals, navigation marks, floating objects, weather and…
To steer a sailing vessel closer towards the wind. Luffing up reduces the angle between the vessel’s heading and the true or apparent wind and normally requires the sails to be trimmed for the new course. The term describes a heading change, whereas a sail itself luffs when its leading edge loses smooth airflow and…
To set or increase sail in preparation for or while proceeding under sail. Making sail can include hoisting, unfurling or setting one or more sails and trimming them for the intended course. The expression may describe getting under way under sail, but it can also mean adding sail after the vessel is already under way….
The sail set on the mainmast and normally regarded as the principal sail of that mast. On a modern sloop or cutter it is usually a fore-and-aft sail with its luff attached to or close to the mast and its foot on a boom or loose-footed. Other rigs use gaff, lug, square or multi-masted arrangements,…
An adjustable fitting or car that moves the mainsheet’s effective deck attachment across or along the vessel. On many yachts the car runs on a transverse track and changes the boom’s lateral position without the same change in sheet tension that would occur by easing the mainsheet. This allows angle of attack and leech tension…
To secure a line or object so that it remains held in the required position. A line may be made fast to a cleat, bollard, bitt, samson post or other suitable fitting using the appropriate turns, hitch, splice or hardware. The instruction can also apply to securing a vessel, fender, tender or item of equipment….
Moving through the water rather than merely moving over the ground with the surrounding water. A vessel may be making way under engine, sail, oars, tow or another means; the expression does not require its own propulsion. Conversely, a vessel drifting with a current can move over the ground while making little or no way…
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