What is the main function of a sectional chart in aviation?

The primary function of a sectional chart in aviation is to facilitate visual flight rules (VFR) navigation. Sectional charts are designed specifically for pilots flying under VFR. They provide critical information about terrain, airspace, navigational aids, and points of interest, allowing pilots to navigate visually rather than relying solely on instruments. This chart type displays topographical features, such as rivers, mountains, and cities, which aids in visual orientation and situational awareness during flight.

While other choices mention important aspects of aviation, they do not pertain to the core purpose of sectional charts. Detailed specifications about aircraft or listings of aviation regulations are not the focus of these charts, nor do they provide specific flight paths for commercial airlines, which are typically represented in a different format. Sectional charts are essential tools for pilots needing to navigate visually and safely in the airspace.