A container arrives at the terminal gate with a valid booking, a clean set of documents and no verified gross mass on file. The terminal will not load it. Under SOLAS Chapter VI, Regulation 2, as amended, a packed container may not be loaded aboard a ship unless its verified gross mass has been declared to the carrier and the terminal in advance. The rule is short, absolute, and carries no goodwill exception for a good customer.
The verified gross mass is the total mass of the container: the cargo, every pallet, case and crate, all dunnage, securing and packing material inside the box, and the container's own tare. It is not the cargo gross weight you declare to customs, and the two figures will differ by the tare plus the dunnage. Tare is stencilled on the door and shown on the CSC safety approval plate, but a container that has been repaired or re-floored can weigh more than its stencil claims.
SOLAS permits two methods. Method 1 is weighing the packed container on calibrated, certified equipment, and a public weighbridge ticket is the usual evidence. Method 2 is a calculation: weigh or take certified weights for every package and cargo item, add dunnage and securing material, add the tare, and use a method approved by the competent authority of the state where packing took place. Method 2 is only as good as its inputs, and supplier-stated carton weights are the usual weak point.
The party named as shipper on the ocean bill of lading makes the declaration, and that responsibility does not move. A forwarder, a consolidator or a packing warehouse can submit the figure on the shipper's behalf, and most do, but the declaration must be signed by a person the shipper has authorised, and the shipper carries the consequence of a wrong number. Submission is normally electronic, through the carrier's portal or by EDI, rather than on paper at the gate.
VGM has its own cut-off, and it is a different deadline from the documentation cut-off. On most services it falls before the container-yard closing, so a figure that travels with the shipping instructions arrives late. Cut-offs are set per vessel and per terminal, expressed in local port time, and they move earlier when a schedule changes. Treat the VGM cut-off as a separate line in the shipment plan with its own owner, not as part of the paperwork bundle.
Miss it and the outcomes are graded. Some terminals refuse the gate-in outright, leaving a loaded box on a chassis with the trucker waiting and detention running. Others accept the container and then simply do not load it, which is worse, because the cargo is inside the terminal, the vessel has sailed, and the next usable slot may be a week away. Once a container rolls, the costs compound: storage, re-stow, a new booking, manifest amendment and a fresh set of cut-offs.
Accuracy matters as much as timeliness. SOLAS sets no tolerance of its own; individual administrations have published their own figures, and terminals apply re-weigh thresholds that trigger a scale check and a fee when the declared mass does not match. Two other ceilings sit alongside the VGM: the maximum gross mass on the CSC plate, which must not be exceeded at all, and the road weight and axle limits on the inland legs, which are often stricter than the container's own rating.
For an LCL consignment the consolidator packing the box is the shipper on the master bill and declares the VGM, but it does that arithmetic from the weights each customer supplied. A carton weight understated at the factory becomes a discrepancy at the terminal scale and a re-weigh charge apportioned back. Where we pack or supervise packing at origin, we weigh the loaded container and keep the ticket on file; where a supplier loads and seals its own box, we need their weighbridge evidence, not an estimate.
