What are approach plates used for specifically during flight?

Approach plates are critical tools used primarily for instrument approaches during flight, which include specific altitudes, waypoints, and procedures necessary for safely navigating an aircraft as it prepares to land at an airport. These plates provide pilots with detailed information regarding the approach path, including minimum visibility requirements, approach routing, and any necessary communication procedures with air traffic control during the approach phase.

Understanding the information on approach plates is essential for pilots to execute landings under various weather conditions, particularly when visibility might be compromised. They ensure that pilots adhere to predefined standards for safety and efficiency, helping them manage altitudes and navigation throughout the approach.

Other options might imply limited uses of approach plates or specific environments, but they do not encompass the comprehensive and critical role that approach plates play across various approach types, including both precision and non-precision approaches. Therefore, the main purpose of approach plates during flight is indeed for instrument approaches, complete with associated altitudes and procedural guidelines.