Plain English Meaning
The printed information around the edges of a chart that tells you which chart it is, when it's valid, and how to read it correctly.
Full Definition
Information printed in the borders of an aeronautical chart that identifies the chart and explains how to use it. Margin identification typically includes the chart name, edition number, effective dates, scale, projection, legend references, and procedural notes printed outside the main chart image.
Context Anchor
Seen when reading or checking aeronautical charts, especially before using a chart for flight planning or navigation.
Derivation
Margin comes from the Latin margo, meaning 'edge' or 'border.' Identification here keeps its plain meaning: information that identifies. Together: the identifying information placed around the edge of the chart.
Why Pilots Care
Ensures the pilot confirms they are using the correct and current chart before relying on it for navigation or approach guidance.