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在航海运营的调度、靠港、货运衔接中,“ETA、ETB、ETC、ETD” 是高频出现的时间术语 —— 调度员靠它们安排港口泊位,货主凭它们规划提货流程,船员依它们制定航行计划。但实际操作中,常有新人将 “ETA” 与 “ETB” 混为一谈,或误将 “ETC” 当作 “ETD” 使用,导致港口衔接延误、货运计划失准。实际上,这四大术语分别对应 “到港、靠泊、完货、离港” 四个关键节点。理清它们的定义、区别与使用场景,既是航海从业者的基础技能,也是保障船舶高效运营的关键。
In the scheduling, berthing, and cargo connection of maritime operations, "ETA, ETB, ETC, ETD" are high-frequency time terms—dispatchers rely on them to arrange port berths, shippers use them to plan cargo pickup processes, and crew members depend on them to formulate navigation plans. However, in actual operations, new practitioners often confuse "ETA" with "ETB", or mistakenly use "ETC" as "ETD", leading to port connection delays and inaccurate cargo plans. In fact, these four terms correspond to four key nodes: "arrival, berthing, cargo completion, and departure". Clarifying their definitions, differences, and application scenarios is not only a basic skill for maritime practitioners but also the key to ensuring efficient ship operations.
Great Heat
Estimated Time of A, B, C, D
一、四大时间术语的核心含义
Core Meanings of the Four Time Terms
提到航海中的 “时间术语”,很多人会默认是 “船舶到港或离港的大概时间”,但 ETA、ETB、ETC、ETD 的定义有明确的节点指向,甚至涉及 “操作状态” 的本质区别:
When it comes to "time terms" in maritime operations, many people default to "the approximate time a ship arrives at or departs from a port". However, the definitions of ETA, ETB, ETC, and ETD have clear node orientations, and even involve essential differences in "operation status":
1. ETA(Estimated Time of Arrival):船舶的 “到港预告时间”
ETA (Estimated Time of Arrival): The "Predicted Arrival Time" of the Ship
· 定义:指船舶预计抵达目的港锚地或港口指定水域(如引航员登船点) 的时间,而非直接靠泊时间,是港口调度提前安排引航员、泊位的基础依据。
· 特点:受航行天气(如大风、洋流)、船舶航速影响较大,需根据实际航行情况动态调整 —— 例如某船原 ETA 为 “10 月 5 日 14:00”,因遭遇强逆风航速下降,需更新 ETA 为 “10 月 5 日 18:30” 并通知港口。
· 英文释义:The estimated time when a ship is expected to arrive at the anchorage of the destination port or the designated waters of the port (e.g., pilot boarding point), not the direct berthing time.
2. ETB(Estimated Time of Berthing):船舶的 “预计靠泊时间”
ETB (Estimated Time of Berthing): The "Completed Berthing Time" of the Ship
· 定义:指船舶预计完成靠泊操作、系好缆绳的时间,需在 ETA 之后(通常间隔 1-2 小时,含引航、掉头、系缆等流程),是货主、装卸公司准备卸货的关键参考。
· 举例:某船 ETA 为 “10 月 5 日 14:00”(抵达引航员登船点),引航登船后需 1 小时驶至泊位并完成系缆,其 ETB 即为 “10 月 5 日 15:00”。
· 英文释义:The estimated time when a ship is expected to complete berthing operations and secure mooring lines, usually 1-2 hours after ETA.
3. ETC(Estimated Time of Completion):船舶的 “预计完货时间”
ETC (Estimated Time of Completion): The "Estimated Cargo Completion Time" of the Ship
· 定义:指船舶预计完成全部装卸货、加油、淡水补给等港口作业的时间,而非离泊准备或离港时间,是港口调度安排后续泊位使用、船方制定离泊计划的核心依据。
· 注意:ETC 需根据作业量动态调整,例如某船 10 月 6 日 10:00 开始卸货(ETB 为 10 月 6 日 09:30),装卸效率 2000 吨 / 小时,需卸载 10000 吨货物,完货时间即为 “10 月 6 日 15:00”,故 ETC 为 “10 月 6 日 15:00”。
· 英文释义:The estimated time when a ship is expected to complete all port operations such as loading/unloading, refueling, and fresh water supply, not the departure preparation or departure time.
4. ETD(Estimated Time of Departure):船舶的 “实际离港时间”
ETD (Estimated Time of Departure): The "Actual Departure Time" of the Ship
· 定义:指船舶预计驶离泊位、离开港口指定水域(如引航员离船点) 的时间,是货主确认货运时效、下一港口安排接卸的核心依据,通常在 ETC 之后 30 分钟至 1.5 小时(含离泊准备时间)。
英文释义:The estimated time when a ship is expected to depart from the berth and leave the designated port waters (e.g., pilot disembarkation point).
二、总结:四大术语的核心记忆点
Conclusion: Core Memory Points of the Four Terms
记住以下四个核心结论,即可彻底分清四大术语区别:
ETA 看 “到港水域”:是抵达锚地 / 引航点的时间,用于安排引航员,受航速、天气影响;
ETB 看 “靠泊完成”:是系好缆绳的时间,用于货主准备卸货,在 ETA 后 1-2 小时;
ETC 看 “作业完成”:是装卸货、补给等全部作业结束的时间,用于港口协调泊位,耗时取决于作业量;
ETD 看 “离港水域”:是驶离泊位 / 引航点的时间,用于下一港口接卸,在 ETC 后 30 分钟 - 1.5 小时。
对于航海从业者,精准使用四大时间术语及邮件缩写,是高效沟通的基础;对于货主、物流人员,明确各术语对应的节点,能更合理规划货运衔接 —— 这些看似简单的字母组合,实则是串联全球航运调度、货运时效的 “时间纽带”,直接影响船舶运营效率与货运服务质量。
Remember the following four core conclusions to completely distinguish the four terms:
ETA focuses on "arrival waters: It is the time to reach the anchorage/pilot point, used to arrange pilots, and affected by speed and weather;
ETB focuses on "completed berthing: It is the time to secure mooring lines, used by shippers to prepare for unloading, 1-2 hours after ETA;
ETC focuses on "operation completion: It is the time when all operations such as loading/unloading and supply are completed, used by ports to coordinate berths, and the time-consuming depends on the amount of work;
ETD focuses on "departure waters: It is the time to leave the berth/pilot point, used for unloading at the next port, 30 minutes to 1.5 hours after ETC.
For maritime practitioners, the accurate use of the four time terms and email abbreviations is the basis for efficient communication; for shippers and logistics personnel, clarifying the nodes corresponding to each term can help plan cargo connection more reasonably—these seemingly simple letter combinations are actually the "time link" connecting global shipping scheduling and cargo timeliness, directly affecting ship operation efficiency and cargo service quality.
三、互动讨论:你还想了解哪些航海术语?
看完这篇,相信大家对 ETA、ETB、ETC、ETD 已经一目了然啦!不过航海领域的专业术语可不止这些 —— 你在工作或学习中,还遇到过哪些容易混淆的航海术语(比如 iagw&wp 这类)?或者下次想深入了解哪个航海主题(比如港口操作流程、船舶设备术语)?欢迎在评论区留言分享,说不定下一篇推文就为你量身定制!
ETA(Estimated Time of Arrival,预计到港时间):依据《国际海事避碰规则》附录 V,指船舶预计抵达目的港锚地或引航员登船点的时间,精度需到 “小时:分钟”,用于港口调度安排引航。
ETB(Estimated Time of Berthing,预计靠泊时间):指船舶预计完成系缆、靠泊操作的时间,通常在 ETA 后 1-2 小时,是货主、装卸公司准备卸货的依据,需符合 IMO《船舶报告系统指南》的操作标注要求。
ETC(Estimated Time of Completion,预计完货时间):指船舶预计完成装卸货、加油、补给等全部港口作业的时间,是港口协调下一泊位、船方制定离泊计划的核心依据,需根据作业量动态调整。
ETD(Estimated Time of Departure,预计离港时间):指船舶预计驶离泊位、离开港口指定水域的时间,精度需到 “小时:分钟”,需通过 VHF 或 AIS 向港口报告,是下一港口安排接卸的关键参考。
ETA Estimated Time of Arrival 预计到港时间
ETB Estimated Time of Berthing 预计靠泊时间
ETC Estimated Time of Completion 预计完货时间
ETD Estimated Time of Departure 预计离港时间
引航员登船点(Pilot Boarding Point)
船舶交通服务(Vessel Traffic Service, VTS)
《国际海事避碰规则》(International Regulations for Preventing Collisions at Sea)
航路点(Waypoint, WP)
载重吨(Deadweight Tonnage, DWT)

