What does the term "visual line-of-sight" (VLOS) refer to in drone operations?

The term "visual line-of-sight" (VLOS) in drone operations refers to the requirement that the operator must be able to see the drone with their own eyes at all times during flight. This rule is important for ensuring safety and control, as it allows the operator to be aware of the drone's surroundings and any potential obstacles or hazards. By maintaining visual contact, the operator can make real-time adjustments based on what they observe, which is crucial for safe operation, especially in environments where other aircraft, people, or structures might be present.

In terms of regulations, VLOS helps prevent accidents and enhances situational awareness, allowing the operator to respond quickly to any changes that may affect the safe operation of the drone. It emphasizes the importance of direct visual oversight rather than relying solely on instruments or technology, which can be limited by factors like signal loss or technical failure.