Estimated time of arrival (ETA)
Estimated time of arrival (ETA) is when a shipment is expected to reach its destination, expressed as a projected date and time. It pairs with ETD (estimated time of departure); ATA and ATD record the actuals. ETAs were once static carrier quotes; modern ones are recalculated continuously from GPS telematics, vessel AIS positions, and port congestion data, giving planners days of warning before a slip becomes a missed delivery.
Examples
Acting on a slip: A vessel ETA for 4 containers of motor laminations moves from June 12 to June 19 while the ship is mid-Pacific. The buyer air-freights 1,800 pieces for about $9,200 to cover 5 production days and lets the rest arrive by sea, avoiding a stoppage estimated at $40,000 per shift.
Carrier ETA scorecard: A logistics manager measures carriers on whether the final ETA lands within 48 hours of actual arrival. Carrier A hits the window 94 percent of the time, Carrier B 71 percent; B's lanes get 3 extra days of planning buffer, and B loses volume at the next bid.
Definition
Four timestamps frame every shipment: ETD and ETA are the estimates for departure and arrival, ATD and ATA the actuals. The spread between ETA and ATA is the honest measure of how predictable a lane is. A quoted ETA from a carrier's transit-time table is a promise made once; a predictive ETA is recalculated from truck telematics, vessel AIS positions, and port queue data every few hours.
The point of a better ETA is not precision for its own sake: it is earlier bad news. A planner who learns six days out that a vessel has slipped four days can expedite the critical fraction of the load, resequence production, and let the rest come by sea; the same news arriving on the due date forces a line stop. Reliable ETAs also feed lead time statistics, and lower variability there directly reduces the safety stock a buyer must carry.
One trap: port ETA is not door ETA. A vessel's arrival says nothing about when the container clears the terminal, and dwell time at congested ports can add a week. Mature teams consume carrier ETAs through track and trace feeds into a supply chain visibility layer and measure each carrier's ETA accuracy rather than taking it on faith.
Related Terms
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