Experienced officer assigned by the charterer of a vessel to advise the management of the vessel and protect the interests of the charterer.

The person, usually an officer, on a merchant ship who is responsible for buying and selling the ship's cargo.

Supercargo is a term in maritime law (adapted from the Spanish sobrecargo, one over or in charge of a cargo) that refers to a person employed on board a vessel by the owner of cargo carried on the ship. The duties of a supercargo include managing the cargo owner's trade, selling the merchandise at the ports to which the vessel is sailing, and buying and receiving goods to be carried on the return voyage.