Definition
Aeronautical charts designed for use under Instrument Flight Rules (IFR), depicting airways, navigation aids, intersections, minimum altitudes, communication frequencies, and airspace boundaries needed to fly by reference to instruments rather than visual landmarks.
Plain English
Maps used by pilots flying on instruments. They show the radio routes, navigation stations, altitudes, and airspace information needed when you can't rely on looking out the window.
Context Anchor
Seen during IFR flight planning and in discussions of special use airspace, because some special airspace areas are shown on instrument charts.
Derivation
“Instrument” comes from a word meaning a tool or device. In aviation, it points to flying by using the airplane’s cockpit instruments. “Chart” means a map made for navigation, so an instrument chart is a navigation map for instrument flying.
Why Pilots Care
They allow safe, legal navigation and airspace compliance when visibility is too low for visual flight.
Intuition Check
Do not read “instrument charts” as charts that explain the airplane’s instruments. Here it means navigation charts used for instrument flying.
Example Sentence 1
Before the IFR flight, she pulled out the instrument charts to review the airways and minimum en route altitudes along the route.
Example Sentence 2
Updated instrument charts showed the new altitude restrictions around the prohibited area.