Aside from visual lines of positions, what is another use of celestial navigation?

Celestial navigation primarily utilizes observations of celestial bodies to determine a vessel's position at sea. One of its essential applications is in determining compass error, which is crucial for ensuring accurate navigation. By comparing celestial observations with magnetic compass readings, navigators can identify discrepancies caused by magnetic variation or local magnetic interference. This process allows sailors to adjust their navigational courses more accurately, enhancing overall safety and precision at sea.

While other options may relate to navigation or sailing practices, they do not directly use celestial navigation techniques. Plotting charts, calculating distance traveled, and estimating fuel requirements are critical navigation tasks but are not specifically tied to the celestial navigation method for deriving position or correcting compass readings. Thus, determining compass error stands out as a purpose closely linked to celestial navigation, reinforcing its importance in maritime operations.