Visual scanning is most effective when it is:

Visual scanning is most effective when it is systematic and continuous because this approach ensures that all areas of interest are covered consistently and thoroughly. A systematic scan involves following a methodical pattern that helps in monitoring the environment effectively, allowing for the detection of potential hazards and changes that may not be noticed with random or sporadic scanning. Continuous scanning maintains situational awareness and is critical in aviation, where conditions can change rapidly.

Choosing only to scan during certain situations, such as landing, limits the opportunity to notice important developments or threats that could arise at any time. Additionally, while certain weather conditions may influence visibility or the way scanning is conducted, effective visual scanning relies on a consistent practice rather than adaptation to external factors. Therefore, a systematic and continuous approach is the most effective for maintaining awareness and ensuring safety in aviation operations.