What does "MEF" refer to in sectional charts?

In sectional charts, "MEF" refers to the Maximum Elevation Figure, which is a critical piece of information for pilots navigating in an area. The MEF is the highest terrain or obstacle elevation within a given area, rounded up to the next 100 feet, and provides an essential safety margin for flight. It ensures that pilots are aware of the highest elevation they might encounter if they fly at that altitudinal level. The inclusion of MEF values on sectional charts helps prevent terrain and obstacle conflicts, particularly in areas that may not be immediately visible from the air.

This information is vital for flight planning and situational awareness, as it allows pilots to maintain a safe altitude that is sufficiently above any natural or man-made obstructions. Knowing the MEF for the airspace being navigated can help pilots establish safe cruising altitudes and avoid unintentional altitude infringements, thus enhancing safety during flight operations.