Upon approach the F-4 lost all navigational instruments and communications.
进近后， F-4 失去了所有导航仪器和通信。
奇趣工程百科
It is equipped with a full complement of navigational instruments, as well as an autonomous hover system on the front side of the cockpit control panel.
它配备了全套导航仪器，以及位于驾驶舱控制面板前侧的自主悬停系统。
新托福Tpo听力
Long before the development of, uh, advanced navigational tools in Europe, Pacific islanders were travelling from New Zealand to Hawaii and back again, using nothing but the stars as their navigational instruments.
Navigational instruments refers to the instruments used by nautical navigators and pilots as tools of their trade. The purpose of navigation is to ascertain the present position and to determine the speed, direction etc. to arrive at the port or point of destination.