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A recessed or enclosed working area from which a small craft is commonly steered or operated. On sailing yachts it often contains the helm, seating, mainsheet or other sail controls; on motorboats it may form the helm and passenger area. Cockpits can be aft, central or forward, open or sheltered, and some boats have more…
A relative approach on which two vessels will collide if neither changes its movement. A steady bearing accompanied by decreasing range is a classic indication that another vessel may be on a collision course. The bearing may be observed visually or by suitable instruments, but small changes can be difficult to detect and uncertainty increases…
An access passage or opening between a vessel’s deck and accommodation or a lower deck. On a yacht it commonly comprises an opening from the cockpit or deck, a sliding hatch or hood, washboards or doors, and companionway steps or a ladder. On larger vessels the term can describe a stairway or passage connecting decks….
Steps or a steep ladder providing access through a companionway between deck levels. On a small craft they commonly lead between the cockpit and accommodation and may be removable to provide machinery access. Larger vessels may use more conventional stairs, but the term still refers to the access within the companionway rather than to the…
A power-driven vessel severely restricted in its ability to leave its course because of its draught in relation to the available navigable water. The status depends on both depth and width: a deep-draught vessel in a channel may be unable to alter course without losing adequate under-keel clearance or leaving the water it can safely…
To overturn a vessel beyond its normal stable operating attitude, potentially onto its side or fully inverted. Capsize can result from excessive wind or wave force, loss of stability, flooding, shifting load, collision or handling error. The outcome differs greatly between a self-righting yacht, recoverable dinghy, multihull, open powerboat and larger vessel. A knockdown from…
To release a mooring, towing or other securing line from its fitting. The expression is commonly used when a vessel leaves a berth, buoy, rafted position or tow. A line may be cast off from aboard, released ashore and recovered, or slipped so that it can run free without someone remaining on the berth. The…
A multihull vessel with two hulls connected by crossbeams, a bridge structure or a deck. Catamarans may be sail- or power-driven and range from small beach craft to cruising yachts, workboats and large ferries. The hulls are usually similar, but need not be identical in every design, and accommodation or payload may be carried in…
Progressive wear caused by rubbing between a line, sail, cable or other component and another surface. Movement under load can abrade fibres, coatings, stitching or metal at fairleads, cleats, spreaders, stanchions, sheaves and contact points. Internal fibre-on-fibre movement, heat and contamination may also damage a line even when external wear looks limited. Chafe protection spreads…
A pump arranged to remove water that collects in a vessel’s bilge or other low internal space. Bilge pumps may be manual, electrically driven, engine-driven or portable. Automatic electric installations often use a level or float switch, while suction strainers, non-return arrangements and discharge pipework help the system operate without blockage or backflow. Pump capacity…
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