Effective 1 July, 2016, the International Maritime Organization (IMO) will start enforcing the Safety of Life at Sea (SOLAS), all loaded containers are required to have a Verified Gross Mass (VGM) declared by shippers prior to loading on the vessels for export.
IMO - Advice regarding verification of gross mass of packed containers
IMO – Advice to Administrations, Port State Control Authorities, Companies, Port Terminals and Masters regarding the SOLAS requirements for Verified Gross Mass of packed containers. (MSC.1/Circ.1548)
WSC - Safe Transport of Containers by Sea Industry Guidance for Shippers and Container Stuffers