.航海学英语词汇中文英文英文缩写航海学Navigation地文航海Terrestrial navigation天文航海Celestial navigation航线设计Passage planning海图Nautical chart电子海图Electronic navigational chartENC电子海图显示信息系统Electronic chart display information systemECDIS航迹推算Dead reckoning船舶定位Ship position fixing陆标定位Position fixing by landmark电子定位Electronic position fixing方位定位Fixing by cross bearings距离定位Fixing by distances移线定位Running fix助航仪器Navigational instrum