How are waypoints marked on aviation charts?

Waypoints are marked on aviation charts using small circles or icons along with their identifiers. This visual representation helps pilots easily identify the waypoint location while navigating. The use of small circles or icons serves as a clear and immediate visual cue on the chart, and each waypoint is typically labeled with a unique alphanumeric identifier. This method facilitates quick reference and ensures that pilots can follow routes accurately, enhancing situational awareness in the cockpit.

The other options do not accurately reflect the standard practices for waypoint marking, focusing instead on alternatives that are not typically used in aviation navigation. For example, dotted lines might indicate routes or paths rather than specific waypoint locations, while alphanumeric codes alone would not provide the necessary spatial context without the accompanying visual markers. Similarly, varying colors related to altitude are not a standard method for waypoint identification, which is more focused on unique identifiers that are visually supported.