The concept of dead reckoning is primarily concerned with which aspect of flight?

Dead reckoning is a fundamental navigation method that involves calculating one's current position by using a previously determined position and then advancing that position based on known or estimated speeds over a specific time period. This method relies heavily on consistent measurements of airspeed and time and does not require external references or landmarks.

When pilots apply dead reckoning, they compensate for winds and other factors that might affect their trajectory, allowing them to predict where they will be at any given point in time. This technique is essential for navigating in areas where visual references may be limited, such as over oceans or in poor weather conditions.

In contrast, communication with ground control is vital for receiving instructions and updates about air traffic and weather, but it does not inherently relate to the concept of dead reckoning. Estimation of fuel usage is also key for flight planning and safety but exists as a distinct aspect of flight operations separate from navigation techniques. Lastly, visual landmark identification relies on external references to determine position and course, which is opposite to the self-contained calculation method associated with dead reckoning.