dead reckoning
英
美
- dead adj.死的；不起作用的；无趣的；筋疲力尽的；麻木的；完全的；无效的；沉闷的；（指球）界外的adv.完全地；直接地；突然地
- reckoning n.计算；算帐；账单动词reckon的现在分词.
Noun:
-
an estimate based on little or no information
-
navigation without the aid of celestial observations
- It was cloudy; and the captain had to calculate our position by dead reckoning.
空中阴云密布，船长不得不用罗盘测航法以确定我们的位置。
