In the merchant marine, the Chief Mate, although being the Safety Officer, designates the 3rd Mate as the Safety Representative, who's duties are to check all life-saving & fire-fighting equipment, and as well, give shipboard familiarization tours to new crewmembers. Should the 3rd Mate be unsure of an item or procedure or otherwise, he/she then would seek guidance from the Chief Mate. The Chief Mate's primary duties are cargo - load/unload planning (including the sequence of de-ballasting & ballasting), in charge of the actual load/unload process, on-board maintenance duties for the deck crew, deck inventory checks and ordering, and along with those mentioned, the standing of a watch (usually the 4-8 watch). The fundamental difference between the CG and the merchant marine, is that our raison d'etre, is the carriage of cargo.