In navigation, what does the term "waypoint" refer to?

The term "waypoint" in navigation refers specifically to a designated geographical point that is used for navigation purposes. Waypoints serve as reference points on a route, allowing navigators to plot their course and track their progress. These points can be defined using coordinates (latitude and longitude) and can be utilized in various navigation systems, such as GPS. By marking specific locations along the intended path, waypoints help in guiding vessels accurately to their destinations while also providing situational awareness of the navigation area.

Other options do not accurately reflect the definition of a waypoint; they pertain to different aspects or components of navigation. A navigational device refers to tools or instruments used to aid navigation, such as compasses or GPS units. The speed of a vessel is a measure of how fast it is traveling, which is related to performance rather than specific navigation points. A navigation chart is a graphical representation of maritime areas and adjacent waters, indicating features, hazards, and navigational routes, but it does not define a specific point like a waypoint does.