What does the term "VLOS" refer to in RPAS operations?

The term "VLOS" in RPAS (Remotely Piloted Aircraft Systems) operations stands for "Visual Line of Sight." This concept is crucial in the context of drone operations, as it pertains to the requirement that the remote pilot maintains a clear and unobstructed view of the drone during its flight. Keeping the drone within visual line of sight allows the pilot to effectively monitor the aircraft's position, orientation, and movement, which is essential for ensuring safety and avoiding collisions with obstacles, people, or other aircraft.

The emphasis on visual line of sight is particularly important in regulatory frameworks governing drone operations. It helps ensure that remote pilots can make real-time decisions based on what they observe, thereby enhancing situational awareness. The recognition of visual line of sight as a fundamental aspect of drone operation is designed to promote safety in the airspace and protect both the operator and the public.

Other terms like "Virtual Line of Sight" or variations of line of sight in the incorrect options do not align with established regulations or terminology used in the RPAS industry, making them less relevant to standard operational practices.