dead reckoning

n. 推算航行法, 计算法定位, 推算, 猜测

例句与用法：

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。

详细释义：

ph.

1. 【空】【海】航位推算

2. 推测; 猜测