During the Primary Navigation stage, what would be critical to track alongside magnetic course?

Tracking leg time during the Primary Navigation stage is essential because it helps pilots anticipate when they will reach their next waypoint or fix. By understanding the duration of each leg of the flight, pilots can adjust their navigation strategies accordingly, ensuring they remain on course and manage their time effectively. This knowledge aids in coordination with air traffic control and informs decisions regarding altitude changes or course adjustments.

In the context of vertical navigation, maintaining awareness of leg time allows pilots to optimize fuel consumption, ensure they comply with airspace restrictions, and effectively manage descent profiles as they approach their destination. The integration of leg time with magnetic course establishes a comprehensive navigational overview, promoting situational awareness throughout the flight.