What is necessary to specify when issuing a clearance in non-radar conditions?

In non-radar conditions, it is essential to specify the initial route fix or fixes when issuing a clearance. Without radar, air traffic controllers cannot monitor a pilot's position continuously, making it crucial to provide clear and defined initial waypoints for the pilot to follow. This helps ensure that the aircraft remains on a safe and organized path throughout its flight, aiding in traffic separation and preventing potential conflicts with other aircraft.

While other elements like flight altitude, expected departure time, and flight duration are important in overall flight planning and operations, they do not provide the immediate navigational guidance required for tracking the aircraft's path in the absence of radar. Specifying an initial route fix helps establish the framework for the aircraft's route, allowing for better management of air traffic and enhancing safety in non-radar environments.