Multimodal ETA: why the real date isn't the one the carrier gives you
How to build a reliable ETA in multimodal transport by combining carrier events, vessel AIS, cargo flights and the terrestrial last mile.
“When does it arrive?” is the question a forwarder answers most times a day, and almost always with a date it knows could change. The problem isn’t your team: it’s that the ETA each link in the chain gives looks only at its own leg. A reliable multimodal ETA is built by combining several sources.
Why the carrier’s ETA falls short
The estimated arrival date the carrier publishes is a good baseline, but it has limits:
- It’s the ETA to the discharge port, not to your client’s door.
- It updates with a lag versus what the vessel actually does.
- It knows nothing about what happens before (pickup, approach haulage) or after (customs, last mile).
If you only look at that date, you make an incomplete promise.
The layers of a multimodal ETA
An honest ETA combines, for each leg, the best available source:
- Ocean — carrier event + vessel AIS. The DCSA event tells you the plan; AIS gives you the ship’s real position and speed to adjust arrival to port.
- Air — cargo flight tracking. The flight is tracked by its callsign with live air-traffic data, so you know whether the air leg is on time.
- Road — fleet and traffic. Pickup at origin and delivery at destination depend on the vehicle and on road incidents.
- Customs and documentation. A stuck clearance can wreck the best ocean ETA; it has to be counted.
The useful ETA is the one that sums all those legs and recalculates when any of them changes.
From ETA to alert
Having a good ETA is worthless if no one looks at it in time. The quality leap is to flip it around: instead of your team checking each shipment, have the system warn when the ETA moves or when a leg is delayed. That’s how you go from answering “where is it?” to getting ahead: “your cargo is arriving two days late, we’re already handling it”.
What to look for in a tool
- Does it recalculate the ETA with the vessel’s real position, or just repeat the carrier’s?
- Does it cover every mode or only ocean?
- Does it alert on changes, or do you have to go looking?
- Does it show everything in one view for the client and for your team?
Rowan Cargo recalculates the ETA with the vessel’s AIS, tracks cargo flights by callsign, and adds the terrestrial last mile and traffic incidents, all in one control tower with alerts. Want an ETA you can trust? Book a demo.
