Mark course lines on either side to indicate elapsed time and distance per what?

Marking course lines on either side to indicate elapsed time and distance is specifically addressed in the unit's Standard Operating Procedures (SOP). SOPs are critical documents that provide detailed protocols and guidelines which govern operation practices, ensuring consistency and safety in flight operations. They often include operational specifics such as how to manage navigation, communications, and the marking of course lines.

By referencing the unit SOP, pilots and crew can follow established procedures that align with their specific mission requirements, facilitating better situational awareness and effective time and distance management during flight. This practice is often standardized to help all personnel involved in the flight understand their roles and the expected procedures, thus enhancing operational effectiveness and safety.

While a flight plan outlines the route and waypoints, it may not provide the procedural context for marking course lines. An operational manual may give broader operational guidance, while a training directive focuses on training aspects rather than on operational execution. Therefore, the unit SOP is the most relevant document for this specific operation.