The minimum visibility for the RNAV (GPS) approach listed as 400-2 represents what?

The choice indicating a minimum horizontal visibility of 2 statute miles accurately reflects the requirement associated with the RNAV (GPS) approach listed as 400-2. This formulation, commonly seen in approach plates, indicates that the minimum visibility needed for pilots to execute the approach safely is 2 statute miles in horizontal visibility.

The context of the visibility numbers is pivotal: the first part, "400," generally relates to the minimum altitude that a pilot must have above ground level, but it does not indicate a cloud ceiling. In the aviation world, a structured visibility minimum must be met to ensure that pilots have enough visual reference to navigate during the final approach phase to landing. Thus, having at least 2 statute miles of visibility is essential for safely completing an RNAV (GPS) approach, as it allows pilots to see the runway environment clearly enough to land.

This clarification emphasizes the importance of understanding the visibility requirements in instrument approaches for effective and safe flight operations.