Plain English Meaning
The key on the chart that tells you what each symbol, color, and marking actually means.
Full Definition
The reference panel printed on an aeronautical chart that explains the meaning of every symbol, color, line style, and abbreviation used on that chart. It tells the pilot how to interpret what they are seeing on the map, including airport types, airspace boundaries, terrain elevations, navigation aids, obstructions, and special-use areas.
Context Anchor
Pilots use the aeronautical chart legend when reading FAA charts, especially when a symbol or marking on the chart is not immediately familiar.
Derivation
The word legend comes from the Latin legenda, meaning 'things to be read.' On a chart, the legend is literally the part you read first so the rest of the chart makes sense.