What does "VLOS" signify in UAS operations?

"VLOS" stands for Visual Line Of Sight in UAS operations, which refers to the requirement that the operator must maintain direct visual contact with the unmanned aircraft at all times during its flight. This means that the operator should be able to see the aircraft without any visual aids, ensuring the operator can navigate and control the aircraft safely and effectively.

Maintaining visual line of sight is crucial for avoiding obstacles, complying with safety regulations, and ensuring the aircraft does not enter restricted areas or endanger other aircraft. This concept is fundamental in UAS operations as it enhances situational awareness and allows for immediate responses to unexpected situations.

While the other terms may seem plausible, they do not accurately capture the essential meaning of VLOS within the context of UAS operation where maintaining direct visual contact is a regulatory and safety imperative.