A dispatcher builds Tuesday's pull schedule on Sunday night. Three drivers, nine appointments, two warehouses that close at 4 PM. Monday morning the carrier pushes the vessel's ETA back 36 hours because of a berth conflict in Cartagena. Nine appointments are now worthless, three drivers have an open day, and two warehouses need a new delivery window they may not have room for. None of this shows up as a line item on an invoice. It shows up as a scramble.
Why Vessels Run Late in the First Place
Ocean carrier schedule reliability has hovered in the 50-60% range for years industry-wide, which means close to half of all vessel calls miss their original published arrival window by a day or more. Port Miami and Port Everglades aren't exempt from that math just because they're smaller than the mega-ports out west.
None of these causes are unusual. They happen on a normal week, not just during disruptions. A drayage operation planning around a published ETA as if it were fixed is planning around a number that's wrong close to half the time.
How One Delay Becomes a Dozen Problems
A late vessel doesn't just delay the containers on board. It delays the terminal's ability to process every other vessel queued behind it, because berths and cranes are shared resources. One ship running 36 hours behind can push the next three vessels back by hours each, even if those ships themselves ran on time.
On the drayage side, the damage compounds fast. A driver booked for a 9 AM terminal appointment tied to a container that isn't discharged yet has nothing to pull. That appointment slot is gone, not postponed, because most terminal booking systems don't let you hold a slot for cargo that hasn't cleared discharge. The driver either sits idle or gets reassigned to a different job, and the original container has to wait for a new appointment slot that may not open for another day.
How Dispatchers Track Vessels Before They Arrive
A dispatcher who waits for the terminal's "available" status to find out a vessel is late is already behind. Most carriers publish updated ETAs through their own tracking portals, and terminal operating systems like eModal reflect updated vessel windows once the carrier files them, usually well before the ship is visible on AIS tracking near the port.
- Carrier vessel tracking portals, checked daily for any active booking, not just the morning of pickup
- AIS-based vessel tracking services that show real-time position and speed, useful for catching a slowdown before the carrier updates its own ETA
- Terminal appointment systems, which often show "vessel not yet discharged" status before a formal delay notice goes out
- Direct relationships with terminal operations staff, who sometimes know about a berth conflict hours before it hits any public system
Checking two or three sources instead of one catches delays earlier, and earlier warning is the entire difference between rebuilding a schedule calmly the night before and scrambling at 7 AM with a driver already en route.
Rebuilding the Dispatch Board on Short Notice
When a delay notice hits, the first move isn't rebooking the missed appointment. It's figuring out what else can fill that driver's time. A fleet with only exactly as many jobs as drivers has nowhere to shift capacity. A fleet running a few open-ended regional moves or export pulls alongside its import schedule has somewhere to put an idle truck for a few hours instead of paying a driver to wait.
What Shippers Can Do to Absorb the Hit
Shippers can't control a vessel's schedule, but a few habits reduce how much a delay actually costs them. Building a day of slack into any delivery commitment tied to an ocean shipment means a 24-hour vessel delay doesn't automatically become a missed customer deadline. Treating a published ETA as a planning estimate rather than a guarantee, and asking a drayage partner for the tracked status rather than the original booking date, catches problems before they become late deliveries.
Warehouses that can flex a receiving window by even a few hours without a formal rebooking process absorb schedule shifts far better than ones locked into a single fixed appointment with no fallback slot.
Why a Drayage Partner Needs Spare Capacity
A drayage company running every truck at full utilization every day looks efficient on a spreadsheet and performs badly the moment a vessel runs late. There's no slack to absorb a scrambled schedule, which means every delay becomes a missed appointment instead of a reshuffled one.
A fleet that keeps a small buffer, whether that's a driver on a flexible assignment or a standing relationship with an owner-operator who can pick up overflow, turns a vessel delay into an inconvenience instead of a crisis. The containers still move. They just move on a different hour than originally planned, which is a problem a good dispatch team solves quietly instead of one the customer ever has to hear about.