VTS报告点
A specifically designated geographical position where a vessel is required to contact and report to the Vessel Traffic Service (VTS) with position, status, and intentions.
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Browse Nav terms for maritime professionals.
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主机停车
Engine telegraph order to cease all propulsion; used when vessel is to remain stationary or fully secured at berth.
View term主机待命
Order for main engines to be ready for immediate use, typically before departure, arrival, or manoeuvring.
View term交通分隔制
An internationally recognized routing measure that separates opposing streams of vessel traffic by defined lanes and rules to reduce collision risk in busy or restricted waters.
View term仅留一根缆绳
Order to reduce the number of mooring lines on each bollard to one, preparing the vessel for departure.
View term位置完整性监测
Continuous verification of the reliability and accuracy of the ship’s position as provided by navigation systems.
View term偏航角估算
The calculated or visually assessed angle between a vessel’s heading and actual course over ground, caused by wind or current.
View term全球导航系统
A satellite-based navigation system such as GPS, GLONASS, Galileo, or BeiDou, providing worldwide position, navigation, and timing services to vessels.
View term全速前进铃
Engine telegraph order instructing propulsion at full engine speed ahead, typically used in open sea or to quickly gain speed.
View term全部松开缆绳
Final order to release all mooring lines, allowing the vessel to depart from berth.
View term前进-侧移表
A manoeuvring aid providing predicted advance (distance along original track) and transfer (lateral distance) for specific speeds and rudder angles to plan safe turns.
View term动态吃水裕度
An additional draught margin included to account for dynamic effects such as squat, trim, and vessel movement in shallow waters.
View term半速前进铃
Engine telegraph order instructing propulsion at half engine speed ahead, used for moderate manoeuvring or departure from berth.
View term卫星定位
A position determined using satellite navigation signals, typically from systems like GPS or GLONASS, used for precise ship positioning.
View term回旋圆直径
The distance perpendicular to the original track between tangents of the vessel’s path when executing a steady-turn at a given rudder angle and speed, usually expressed in ship lengths or cables.
View term安全水域标志
IALA buoyage mark indicating there is navigable water all around the mark.
View term完整性监测警报
An alarm signaling a failure or inconsistency detected in the position integrity monitoring system, requiring immediate action.
View term实时引航数据接口
An active data connection port on the bridge that provides real-time navigational data from the ship's ECDIS or AIS system for the pilot’s portable unit.
View term实际航向
The actual path of a vessel over the ground, as determined by position fixes, regardless of set or drift.
View term实际航迹
The actual path a vessel follows over the ground, as recorded by position fixes, often used interchangeably with course made good.
View term平行标绘法
A radar navigation technique in which fixed radar echoes are kept on predetermined parallel lines to verify the vessel remains on its planned track without constant position fixing.
View term平行标绘线
A radar-derived reference line drawn parallel to the vessel's intended track, used to monitor cross-track error by keeping a chosen land echo or seamark at a constant offset.
View term应急拖带缆绳
A strong wire or rope rigged at bow or stern, readily accessible for emergency towing if the vessel becomes disabled.
View term引航员梯已挂好
A pilot ladder correctly secured and deployed over the ship’s side, ready for safe boarding or disembarkation of the pilot as per SOLAS standards.
View term引航员登轮区
A designated area, marked on charts, where the pilot boards or disembarks from a vessel, usually at port approaches or fairway entrances.
View term引航灯对准
The process of navigating a vessel by visually aligning two or more fixed leading lights (range lights), ensuring the vessel remains on the recommended channel course.
View term引航航程计划
A detailed route plan, prepared jointly by the master and pilot, outlining intended track, waypoints, speed, and manoeuvres for the pilotage operation.
View term强制报告制度
A regulatory system requiring vessels to provide voyage information at specified locations or intervals, typically enforced by local or international authorities for traffic monitoring and safety.
View term微速倒车
Engine telegraph order instructing propulsion at the lowest possible speed astern, used for delicate reversing or while manoeuvring in tight spaces.
View term微速前进
Engine telegraph order instructing propulsion at the lowest possible speed ahead, used for delicate manoeuvring or congested areas.
View term慢速前进铃
The engine telegraph order for slow speed ahead, typically used during precise manoeuvring, docking, or when entering confined waters.
View term护航拖船连接
The established secured line or method by which an escort tug is physically connected to a vessel, typically for controlling or assisting the ship during harbour or restricted water navigation.
View term拖轮分配计划
A detailed arrangement indicating the number, type, and position of tugs assigned to assist a vessel during berthing, unberthing, or transit in restricted waters.
View term掠沉效应裕度
The additional draught margin applied to account for the increased draught of a vessel due to the squat effect in shallow water.
View term推荐航道
A charted route within a traffic separation scheme or recommended track designed for the safe passage of vessels, but not compulsory. Usage reduces collision risk.
View term操纵速度检查
The process of verifying and confirming the vessel’s speed through the water is suitable for safe manoeuvring during berthing, departure, or restricted navigation.
View term操舵显示布局
The arrangement of navigation and maneuvering information shown on the conning display for optimal bridge decision-making and situational awareness.
View term最小操舵速度
The lowest speed at which the vessel maintains effective steering control, typically specified by the vessel’s maneuvering data.
View term最小起锚速度
The lowest speed required to break the anchor free from the seabed and commence recovery.
View term松开右舷缆绳
Mooring command to release or cast off the starboard (right) mooring line or cable.
View term松舵至五度
Helm order instructing the helmsman to reduce rudder angle to five degrees while maintaining course adjustment.
View term标灯对齐
The navigation technique of steering a vessel so that two range lights, one behind the other, appear vertically aligned, indicating the vessel is on the safe channel axis.
View term桥下净空
The vertical distance between the lowest part of the bridge span and the highest point of the vessel, ensuring safe passage.
View term检查横摇
Helm or mooring order to observe and, if necessary, limit or arrest the vessel's swinging motion, especially when turning or anchoring.
View term横向推力修正
The adjustment applied to helm or engine orders to compensate for the sideways force exerted by a propeller, especially during astern or ahead movements.
View term河岸吸力效应
Hydrodynamic phenomenon where a vessel navigating close to a bank experiences a suction force pulling the vessel toward the bank due to water velocity difference.
View term河岸垫效应
Hydrodynamic phenomenon where water pressure between a vessel and a nearby bank creates a cushion, pushing the bow away from the bank.
View term流向与漂移
The direction (set) and speed (drift) of water current affecting the ship’s course and position.
View term深水航道
A route within defined limits in deep water that is charted and designated for the passage of vessels requiring deep draught, providing safe clearance from underwater hazards.
View term港口引航员登船
The procedure for safely boarding the harbour pilot at sea or at the entrance of the port using a pilot ladder or launch.
View term港口引航员离船
The controlled process by which the harbour pilot safely leaves the vessel after completing the inbound or outbound passage.
View term港口限速
The officially published maximum speed permitted for vessels within a designated harbour or port area, set by local authorities to ensure safety of navigation and infrastructure.
View term满舵右舷
Helm order instructing the rudder to be put fully to starboard (right) for maximum turning effect.
View term满舵左舷
Helm order instructing the rudder to be put fully to port (left) for maximum turning effect.
View term潮汐窗口计算
The process of determining the optimal period based on tidal height during which a vessel can safely transit shallow waters or cross a bar.
View term电子方位线
A digital navigational tool on ECDIS or radar for plotting and monitoring bearings to fixed or moving targets, improving situational awareness.
View term电子距离线
A digital tool on radar/ECDIS allowing navigators to set and measure a precise distance from own ship to a selected point or target.
View term矢量图显示
An electronic navigational chart presented in vector format, enabling interactive layers and detailed, scalable map features for navigation and route planning.
View term磁罗盘偏差
The angular difference between true north and magnetic north, affecting compass readings on board ships.
View term禁止超车区
A defined sector of a channel or waterway where overtaking by vessels is prohibited for safety reasons, often due to restricted width or high traffic density.
View term稳住船头
Helm order given to check the vessel’s swing and prevent further turning, typically after a large rudder movement.
View term空高净空
The vertical distance from the waterline to the highest point of the vessel, used to determine safe passage under bridges or overhead obstacles.
View term紧急操舵位置
A dedicated station—usually aft in the steering gear room—used to control the ship’s steering in the event of bridge steering failure.
View term自动雷达标绘
The process by which radar targets are tracked and collision risk assessed automatically by ARPA systems, displaying real-time information on target movements and CPA/TCPA.
View term航向变更点
A precisely charted position where a ship is required to change its course, usually as part of a passage plan.
View term航向基准故障
A malfunction or loss of accuracy in the ship’s heading reference system, such as gyro or magnetic compass, affecting navigation and safe maneuvering.
View term航点顺序警报
An alarm on navigation systems indicating failure to automatically advance to the next waypoint as programmed in the voyage plan.
View term航迹偏差误差
The perpendicular distance between a vessel's actual position and the planned track line, used for navigation accuracy.
View term航道中线对齐
The practice of steering a vessel so that its longitudinal axis remains aligned with the designated navigational centreline of a fairway, as marked by buoys, lights, or electronic aids.
View term航道设计深度
The minimum depth of a navigational channel as determined and maintained by authorities for safe passage of vessels, referenced to chart datum.
View term航道转向池
A designated widened section of a navigational fairway, specifically constructed to allow vessels to safely turn or change direction under pilotage or tug assistance.
View term舵中位
Helm order to bring the rudder to the midships (zero angle) position, aligning with the vessel’s centerline.
View term舵令确认
The required verbal response by the helmsman to confirm receipt and understanding of a helm order from the officer of the watch.
View term舵位交接程序
The standardised method for transferring control of the ship’s steering from one helm station or operator to another, ensuring continuous and safe steering.
View term船尾净空距离
The available unobstructed distance behind the vessel, critical for manoeuvring astern.
View term船尾拖船位置
The designated location of a tug at the stern of a vessel, used to provide pulling or braking force during manoeuvring, berthing, or unberthing operations.
View term船长引航员交流
A formal communication process between the ship’s master and the pilot to share essential navigation information, plans, and local hazards before pilotage.
View term船首拖船位置
The assigned and maintained location of a tug at the bow of a vessel to provide pushing, pulling, or steering assistance during berthing, unberthing, or manoeuvring in confined waters.
View term警戒区
A defined area where vessels must navigate with particular caution, often due to traffic convergence, hazards, or complex navigation conditions. Special rules or recommendations may apply.
View term转向速率
The speed at which a vessel changes its heading, typically measured in degrees per minute and displayed on the bridge instrument panel.
View term转舵点
The charted position at which the rudder is first applied to initiate a planned course alteration so that the vessel follows the intended turning track.
View term转舵线
A track line shown on chart or radar which, when crossed, indicates the precise moment to start the wheel-over so that the intended new course is met accurately.
View term转舵装置切换
The act of switching from one steering gear system or power unit to another, often for redundancy or in case of equipment failure.
View term转舵警报
An electronic or mechanical alarm that notifies the bridge team when it is time to initiate the wheel-over manoeuvre, usually at a pre-set waypoint or heading.
View term迎风面积效应
The influence of the ship’s exposed surface area above the waterline, causing increased drift or leeway under wind pressure.
View term近岸交通区
A coastal area, adjacent to the landward side of a traffic separation scheme, intended for use by vessels not using the main traffic lanes, such as local or smaller craft.
View term锚反向控制
The controlled paying out of anchor chain in reverse (walkback) under power, used for precise anchor positioning or retrieval.
View term锚起确认
The formal notification to the bridge or engine room that the anchor is clear of the seabed and ship is free to maneuver.
View term锚起速率
The speed at which the anchor cable is hauled in, usually measured in meters per minute, to control anchor recovery.
View term陀螺罗盘误差
An inaccuracy or malfunction of the ship’s gyro compass, resulting in incorrect heading information displayed to bridge equipment.
View term陆地定位
A position established by bearings or distances to known land features or aids to navigation, not using satellites.
View term雷达叠加显示
The presentation of radar information directly on the electronic chart display, enabling visual correlation of radar targets with charted features.
View term雷达回波偏移
The adjustment of the radar image to compensate for systematic error or offset, ensuring true target positions correspond to their charted locations and improving navigation accuracy.
View term雷达标绘手册
A publication or onboard manual containing standardized instructions, techniques, and worksheets for manually plotting radar targets to assess collision risk and avoidance actions.
View term驾驶台操纵记录本
A logbook kept on the bridge for recording all manoeuvring orders, engine telegraph movements, helm commands, and critical events during a vessel's navigation and docking.
View term驾驶台航行值班
A continuous period during which designated officers and crew maintain vigilance and operational control on the bridge to ensure the vessel’s safe navigation.
View term驾驶台资源管理
The effective use and coordination of all available bridge resources—personnel, equipment, and information—to ensure safe navigation and vessel operation.
View term驾驶台音频录音
Continuous audio recording of all conversations and alarms on the bridge as mandated by SOLAS for investigation and safety compliance.
View term龙骨下余隙
Vertical distance between the lowest point of a vessel’s keel and the seabed referenced to chart datum; the key safety margin preventing grounding.
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