dead reckoning

dead-reckoning的词性：
n.（名词）

1. Abbr. DRA method of estimating the position of an aircraft or a ship without astronomical observations, as by applying to a previously determined position the course and distance traveled since.
缩写 DR船位推测法：一种推测飞机或船的位置的方法，不借助天文观察仪器，而通过从航行的方向和距离的精确位置来推算

2. Predictive calculation based on inference; guesswork.
推算；猜测：在推论基础上的论断性的计算；猜测

dead-reckoning的词源：

3. Possibly alteration of ded.
可能为 ded.的变化

4. abbr. of deduced
deduced的缩写

5. from deduce [to trace from the beginning] * see deduce
源自 deduce [由开始探索] *参见 deduce