建站客服QQ：88888888 图片 dead reckoning航迹推算 the dead reckoning plot航迹绘算 precise piloting精确导航 the vessel’s handling characteristics船舶操纵性能 transfer横距 advance进距 turning circle旋回圈 tactical diameter旋回初径 final diameter旋回直径 angle of turn转向角度the Rules of the Road