How much visibility is required on the approach plate when the VDP is 1.1 nm from the runway?

The visibility requirement when the Visual Descent Point (VDP) is 1.1 nautical miles from the runway is typically based on the standards set by aviation regulations and guidance for instrument approaches. For a VDP that is located 1.1 nautical miles from the runway, the appropriate visibility is ½ statute mile. This is because the minimum visibility for a standard approach can vary based on several factors, such as the type of approach and the aircraft's operational procedures.

In this case, the requirement of ½ sm allows pilots to have sufficient visual reference to recognize the runway environment as they reach the VDP. This distance provides a balance between safety and operational efficiency, ensuring that pilots have the necessary visual cues to make landing decisions while still considering the limitations of the aircraft and environmental factors such as weather.

Understanding the specific visibility requirements for different distances from the runway is essential for safe instrument flying and approach procedures.