CMI. Comite Maritime International. A group of international lawyers and law associations specialising in maritime law, based in Antwerp, Belgium. CMI is responsible for some documents used in chartering, e.g., for the “Charterparty Laytime Definitions”. The CMI has also compiled a list of arbitrators, well-experienced in maritime arbitration and able to decide disputes arising from charters. Parties to a charter dispute can choose arbitrators from this list.