What is one of the critical scanning techniques a visual observer should use?

Listening for aircraft sounds before visually spotting them is a critical scanning technique for a visual observer because it enhances situational awareness and helps in identifying potential air traffic that may not yet be in sight. This auditory cue can provide important information about nearby aircraft, allowing the observer to direct their attention accordingly and visually confirm the presence of other aircraft in the area. In aviation, being aware of both visual and auditory cues is essential for safety, especially when operating in airspace where other aircraft may be nearby.

Focusing only on the ground, scanning the sky rapidly without purpose, or maintaining a fixed focus on one direction can limit the observer's ability to detect and identify potential hazards. A comprehensive scanning technique that includes using auditory cues complements visual observations, improving overall monitoring of the airspace and enhancing safety during drone operations.