Plain English Meaning
A flight map used by pilots flying on instruments at lower altitudes. It shows the routes, radio aids, altitudes, and airspace they need to fly safely from one airport to another.
Full Definition
An aeronautical chart published by the FAA for instrument flight rules (IFR) navigation below 18,000 feet mean sea level. It depicts the low-altitude airway structure, including Victor airways, navigation aids, intersections, minimum en route altitudes, controlled airspace boundaries, communication frequencies, and airports with .