QM – Quartermaster
QMs stand watch as assistants to officers of the deck and the navigator; serve as helmsman and perform ship control, navigation and bridge watch duties. QMs procure, correct, use and stow navigational and oceanographic publications and oceanographic charts. They maintain navigational instruments and keep correct navigational time; render "honors and ceremonies" in accordance with national observance and foreign customs; send and receive visual messages; and serve as petty officers in charge of tugs, self-propelled barges and other yard and district craft.