Berth windows and who sets them
Terminals plan berths in advance, and many liner services hold a regular weekly window at each port, agreed between the terminal and the carrier or alliance. A ship that arrives on time slides into its window. One that arrives late may have to wait for the next gap, because the berth has been promised to another vessel. Tides, daylight rules, pilots and tugs add constraints at some ports.
Arrival, berthing and discharge are separate
Three events at the same port are easy to blur. Carriers use the word arrival for different moments, so a vessel arrived milestone may mean the ship reached port limits, anchored or tied up. Check how the carrier defines it before building a pickup plan around it, and remember that your own container may come off well after the vessel berths.
- Arrival: the ship reaches port limits or the anchorage
- Berthing: the ship is secured alongside and cranes can start
- Discharge: your container is lifted off the ship
Knock-on effects of a late berth
A late berthing delays more than the imports on that ship. Export cut-offs for that ship may move, rail connections at the port can be missed, and truck appointments booked for the expected discharge date go unused. Because the next ship's window is fixed, a vessel that berths late may shorten its stay to keep its schedule, leaving some export containers behind for a later sailing.
Example
A vessel reaches the anchorage outside Los Angeles on Sunday but is not given a berth until Tuesday, so its containers start coming off two days after its arrival.
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Questions
What does Berth mean?
A berth is the assigned place along a terminal's quay where a vessel ties up so cranes can load and unload it. Berthing is the moment the ship is made fast there, which can come well after it reaches the port.
What does berthed mean in container tracking?
It means the vessel is tied up at the terminal and cargo work can begin. It does not mean your container has been discharged; that is a separate event that can come hours or days later.
Why is a ship waiting at anchor instead of berthing?
Usually because its berth is still occupied, the terminal is congested, or the ship missed its planned window. Weather, tides and pilot availability can also hold up berthing at some ports.