Why is it important to maintain visual line of sight when operating a UAS?

Maintaining visual line of sight (VLOS) when operating a UAS is crucial primarily for safety reasons. It allows the operator to see the aircraft and its immediate surroundings, which is essential for avoiding obstacles like trees, buildings, and other aircraft. This situational awareness helps the operator make informed decisions to prevent collisions or accidents, thereby ensuring the safety of the operation.

While other factors like battery efficiency or data collection may be relevant in specific contexts, the fundamental reason for VLOS is rooted in the ability to effectively avoid hazards during flight. Visual observation of the aircraft allows the operator to respond to dynamic situations that may not be captured through the onboard sensors or cameras, reinforcing why this practice is a key component in safe UAS operations.