What is the key advantage of using dead reckoning for navigation?

The key advantage of using dead reckoning for navigation is that it requires no visible landmarks. Dead reckoning involves calculating one's current position by using a previously determined position and advancing that position based on known or estimated speeds over time, along with accounting for wind, currents, and other factors. This method allows navigators to determine their course and position without relying on visual cues, making it particularly useful in conditions where visibility is poor or where geographical landmarks are absent. It provides flexibility in navigation, especially over open water or in situations where other navigation aids are unavailable. This advantage is significant because it enables continuous navigation regardless of environmental conditions.