During preflight planning, what resource is essential for confirming waypoint details?

The essential resource for confirming waypoint details during preflight planning is the Airport Facility Directory (AFD), now referred to as the Chart Supplement. This publication provides vital information on airports, including details about the airport facilities, frequencies, and, importantly, the related navigation aids and waypoints associated with the airspace in the vicinity of the airport.

The AFD includes information on VORs, NDBs, and other navigational aids, as well as the associated waypoints, making it a critical reference for pilots searching for accurate waypoint specifications to ensure safe and efficient navigation. This comprehensive resource helps pilots in planning their routes and understanding the characteristics of the available navigation waypoints.

Other resources, while useful in various aspects of flight planning, do not specifically focus on waypoint details. Flight Operation Handbooks provide guidelines for the operation and performance of an aircraft, while Pilot Operating Handbooks are tailored to aircraft-specific information and do not directly address waypoint navigation. Meanwhile, Air Traffic Control guidance offers real-time instructions during flight but may not encompass all waypoint details that need to be confirmed before departure.