Worldwide Maritime Group (IMO) and its Harmful Items Code (IMDG Code). The problem for a shipper is figuring out when to comply with the HMR and when compliance with the IMDG Code is required. To summarize the necessities: a shipper might comply with the IMDG Code - even for transport within the U.S. IMDG Code are met and the shipper complies with 49 CFR 171...