What are Enroute Charts used for?

Enroute Charts are specifically designed to assist pilots with flight planning and navigation during the enroute phase of flight, which occurs between airports. These charts provide critical information such as navigational aids, airways, waypoints, and applicable altitudes, which help pilots maintain their course and altitude throughout their journey. They are essential tools for ensuring safety and efficiency in the airspace system, enabling pilots to navigate correctly and adhere to the established airways while avoiding restricted airspace and terrain.

The other options do not align with the purpose of Enroute Charts. For instance, land navigation in rural areas pertains more to terrestrial navigation methods rather than aviation, while visual aids for ground transportation and legal documentation for airspace use are unrelated to the functions of Enroute Charts in aviation navigation.