Definition
A yard jockey — also called a spotter — moves trailers inside the yard or DC between docks, staging positions, and doors, without running the linehaul trip. It is the physical execution of the yard plan.
A control tower without a jockey is a dashboard staring at parked boxes.
Related: logistics yard · YMS · drop and hook.
What it means in practice
The jockey turns the YMS map into real movement. Without them, “ready” trailers do not reach the door on time.
The typical mistake is measuring only “internal trips” instead of impact on dwell, OTIF, and door utilization.
Why it matters by role
| Role | What they need | If jockey is missing |
|---|---|---|
| Dock | Trailer at door on time | Broken wave |
| Carrier | Fast drop/hook | Idle tractor |
| Yard | Clear sequence | Saturated slots |
| Traffic | Visibility | Unmakeable appointments |
Move data
| Field | Question | Note |
|---|---|---|
| From/to | Which slot to which? | YMS |
| Priority | Which door first? | Dock plan |
| Trailer ID | Correct trailer? | Seal |
| Timestamp | Move start/end? | Dwell |
| Trip | Tied to appointment? | TMS |
Jockey flow in 5 steps
Receive order
Priority
Locate trailer
Slot
Move
To door/staging
Confirm position
YMS
Release next
Queue
Expensive mistakes
1.Radio-only orders
No KPI or dwell dispute.
2.Jockey without YMS/map
Moves by eye and loses trailers.
3.Not prioritizing by appointment
Easy trailers get moved, urgent ones wait.
4.Ignoring safety/damage
Claims on hook without photos.
OCL and the trip file
OCL uses yard move events when available to explain dwell and exceptions in the trip file. It does not manage jockeys. OCL can stamp invoices and Carta Porte.
Sources and further reading
Key takeaways5 points
- Yard jockey (spotter) = who moves trailers inside the yard/DC between docks, staging, and doors — not linehaul.
- If the jockey lacks clear orders, drop and hook and the YMS become endless radio.
- In Mexico the dock bottleneck is often missing jockey/sequence, not missing trailers on a map.
- Record the move: from-slot a to-slot, time, and reason tied to the trip.
- OCL does not run jockeys; it consumes yard events for the trip file. OCL can stamp invoices and Carta Porte.
Is your dock waiting on the jockey — or on the data?
Frequently asked questions
The person/team that moves trailers inside the yard between slots and docks, without linehaul.
No. Linehaul runs the trip; the jockey does internal spotting.
Drop leaves the trailer; the jockey takes it to door or staging per the plan.
It helps a lot. Minimum is orders with ID, slot, and priority.
If the trailer does not reach the door on time, Late starts in the yard.
It ties yard events to the trip to audit detention with evidence.