MCT Moment to change trim 吃水差力矩

MF Medium frequency 中频

MB memorandum book 备忘录

MO Mail order 邮政汇票

N and 和;同

NA Notice of Abandenment 委付通知

NAA Not always afloat 不经常漂浮

NATO North Atlantic Treaty Organization 北大西洋公约组织

NAABSA Not always afloat but safely aground 不经常漂浮但安全搁浅

N.C.V. No commercial value 无商业价值

NHP Nominal horse-power 额定马力

NM Notice to mariners 航海通告