What is the purpose of a flight visibility measurement?

The purpose of flight visibility measurement is primarily to evaluate flight safety and navigation. Visibility directly impacts a pilot's ability to see and avoid obstacles, other aircraft, and to navigate accurately, especially in instrument meteorological conditions. Adequate visibility is essential for both VFR (Visual Flight Rules) and IFR (Instrument Flight Rules) operations, as it informs pilots whether they can safely conduct a visual approach or if they should rely on instruments due to limited sight.

In addition, visibility affects decisions related to departure, arrival, and landings, influencing whether a flight can safely proceed or if adjustments need to be made to flight plans. Pilots must understand and monitor visibility conditions to ensure they can maintain situational awareness and adhere to safety regulations during flight operations.