dead reckoning

名词 dead reckoning:

1. an estimate based on little or no information
   同义词：guess, guesswork, guessing, shot
2. navigation without the aid of celestial observations

1. 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。