The IMO uses the International Maritime Dangerous Goods Regulations Code (IMDG Code) as the basis for international enforcement of dangerous goods transportation by vessel. These regulations are amended every two years with each amendment valid for three years.

The IMDG Code requires the following:

• A declaration from the consignor stating that the particular dangerous goods declared are identified, classified, packaged, marked, labeled and placarded correctly.
• A declaration from the person packing the container to ensure it has been done correctly.