Introduction
For years, container tracking has been the default way to monitor ocean shipments, and it remains a dependable part of how Gravity tracks freight today. What's changing is choice: Gravity customers can now trigger tracking registration using a Container Number, a Carrier Booking Reference (CBR), or a Bill of Lading (BL / Master Bill of Lading), whichever reference is available and best fits how they manage bookings. These additions sit alongside container tracking, not in place of it, giving shippers and forwarders more flexibility and, in many cases, an earlier window into shipment visibility.
Understanding the Three Tracking References
Each of the three references reflects a different point in the shipment lifecycle, which is exactly why offering all three matters:
The physical equipment reference that most supply chain teams already use and recognise across the industry.
The reference issued when a carrier confirms a shipment booking, often available before a container has been assigned.
The legal contract issued by a carrier confirming the transportation of cargo. Each BL carries a unique reference number, such as ONEY1234576 or CMDU1234567, and, unlike a container, which is reused across multiple voyages, is tied to one specific shipment movement.
Why Offer Three Ways to Track?
Every organisation manages bookings a little differently, and the reference data on hand can vary by shipment, trade lane, or operational process. Offering container, CBR, and BL tracking side by side means tracking can begin using whatever reference is confirmed first, rather than waiting on a single data point.
We've also seen that BL and CBR references can offer practical advantages in certain scenarios. Because containers are reused across voyages, milestone data can occasionally be associated with a previous or subsequent journey. And because CBR and BL data is often available before a container is assigned, tracking can sometimes be registered earlier in the process, improving visibility during the booking and planning stages. This isn't the case for every shipment, and container tracking continues to perform reliably for the large majority of freight movements, which is exactly why Gravity offers all three as options, so customers can choose the reference, or combination of references, that best matches how they work.
Built for Automatic, Earlier Registration
Once CBR or BL tracking is enabled, Gravity automatically sends a tracking registration request as soon as a 3PL shipment booking is submitted or updated with a valid reference, with no extra manual steps. Automated registration is supported for shipment bookings created or updated through 3PL import integrations for both reference types, extending the existing container-based tracking model rather than replacing it.
Turning More Tracking Data into Predictive Insight and Automation
Regardless of which reference triggers tracking, the milestone data Gravity collects feeds the same downstream capabilities. Richer, earlier tracking data strengthens predictive ETA calculations, giving supply chain teams a clearer forward view of when shipments will actually arrive rather than relying solely on carrier-published estimates. That same data also powers automation updates, keeping downstream milestones current and supporting timely exception handling without manual intervention. The more complete and timely the tracking data, the sharper the predictive signal and the more teams can automate rather than chase.
Handling Complex Shipment Relationships
Ocean freight rarely follows a simple one-container, one-shipment model. A single BL may cover multiple containers, while multiple BLs may be associated with one container. By offering tracking via container, CBR, or BL, Gravity lets organisations align visibility to whichever level, the physical equipment or the transportation contract, best matches the shipment in question.
Goods in Transit: No Change to How You Work
However tracking is triggered, updates continue to appear in the existing Goods in Transit experience. Milestones and statuses map to the same shipment and container tracking views, the visual experience stays consistent with current tracking behaviour, and no end-user process change is required once a configuration is enabled.
The Gravity Advantage
Gravity's tracking capability now spans container, Carrier Booking Reference, and Bill of Lading data, giving customers the flexibility to register tracking using whichever reference suits their operation. Customers benefit from earlier insights where available, more accurate milestone data, improved exception management, and greater confidence in operational decision-making. This enhanced visibility enables supply chain teams to identify delays sooner, improve customer communication, and proactively manage risk across global logistics networks.
Conclusion
Visibility shouldn't be limited by which reference happens to be available first. With container, Carrier Booking Reference, and Bill of Lading tracking all supported, Gravity gives customers the flexibility to register tracking the way that suits their operation, and turns that data into earlier visibility, sharper predictive ETAs, and more automation across the shipment journey.

