Under 14 CFR § 107.31(a), the visual-line-of-sight requirement must be met using —

Why: 14 CFR § 107.31(a) requires that "with vision that is unaided by any device other than corrective lenses," the remote pilot in command, visual observer, or person manipulating the controls must be able to see the unmanned aircraft throughout the flight.

• Treats vision-enhancing optical devices like binoculars as acceptable substitutes for unaided vision, but § 107.31(a) excludes any device other than corrective lenses.
• Confuses an FPV camera feed viewed on a display with direct unaided visual contact with the aircraft itself; a camera feed does not satisfy the visual-line-of-sight requirement.