What does the term "dead reckoning" refer to in navigation?

The term "dead reckoning" in navigation refers to a method of calculating one's current position based on a previously determined location, along with accounting for speed, time, and direction traveled. This technique is fundamental for navigators, particularly when visibility is poor or celestial navigation is not feasible. By starting from a known point, navigators can estimate their current location by taking into account their course and speed over time, effectively allowing them to navigate even when they cannot see landmarks or celestial bodies.

This method is essential for maintaining accurate navigation and is often used in conjunction with other navigational techniques to verify position. The reliance on a previous location means that accuracy can be challenged if the initial position is wrong or if external factors, such as currents and winds, aren’t adequately considered, underscoring the importance of combining dead reckoning with other navigational methods for enhanced reliability.