What is one of the key functions of the TO-FROM indicator in navigating?

The TO-FROM indicator serves a crucial role in navigating by illustrating the aircraft's relationship to the course. Specifically, this indicator denotes whether the aircraft is flying towards or away from a navigation aid (NAVAID). When the indicator shows "TO," it implies that the aircraft is heading toward the NAVAID, which aids pilots in maintaining or adjusting their course as necessary to reach their destination. Conversely, when it displays "FROM," it indicates that the aircraft is departing from the NAVAID, which can help pilots assess their current position relative to their flight path.

This relationship is essential for pilots to ensure they are on track to their intended waypoints. Understanding the TO-FROM indicator is vital for effective navigation, especially during procedures that involve course corrections or when transitioning between navigational aids.