What visibility requirement must be met in Class G airspace at all altitudes?

In Class G airspace, the visibility requirement is 1 statute mile (SM) during the day and 3 statute miles at night when operating below 10,000 feet MSL. However, the question specifies the requirement at all altitudes, which aligns with the fact that during the day in Class G airspace, the minimum visibility is indeed 1 SM. This is critical for ensuring that pilots can maintain visual contact with other aircraft and the ground, promoting safe flight operations.

Understanding this requirement is essential for pilots operating in uncontrolled airspace, where they must rely on visual reference to avoid obstacles and other traffic. Given the nature of Class G airspace, where air traffic control does not provide separation, adhering to visibility guidelines helps ensure that pilots can see and avoid other aircraft effectively.