Examples from literature

• It goes without saying that mere dead reckoning, entirely unchecked by astronomical observations, would be insufficient for scientific purposes. 
• The distance which we traveled day by day was at first determined by dead reckoning, to be verified later by observations for latitude. 
• The position of the ship was found, and marked on the chart, and the "dead reckoning" compared with the result obtained by calculation. 
• The sketch was made solely by dead reckoning. 
• We had been six days out without an observation, and our dead reckoning naturally was uncertain.