Definition
World Aeronautical Charts are aeronautical navigation charts produced at a scale of 1:1,000,000, designed for use in moderate-speed aircraft and aircraft operating at higher altitudes. They depict cities and towns, principal roads, railroads, distinctive landmarks, drainage, terrain relief, airports, radio aids to navigation, and selected airspace information, but in less detail than Sectional Charts.
Plain English
A type of paper aviation map that covers a large area at a zoomed-out scale. It shows less detail than a Sectional Chart but lets you see more of the country at once, which suits faster or higher-flying aircraft.
Context Anchor
You may see WAC in older FAA study material, chart references, or discussions about long-distance visual flight planning.
Derivation
The name is literal: 'World' because the series was originally part of an international charting program covering much of the globe, 'Aeronautical' meaning relating to flight, and 'Chart' meaning a navigation map. Knowing it began as a worldwide series helps explain why the scale is zoomed out compared to U.S. Sectionals.
Why Pilots Care
They give pilots an overview of an entire route without requiring many smaller charts.
Intuition Check
“World” does not mean one single chart of the entire planet. It means a chart series that covers large areas of the world in broad detail.
Example Sentence 1
For the long cross-country, she chose a World Aeronautical Chart so the entire route would fit on a single sheet.
Example Sentence 2
WAC charts are revised regularly to keep airspace boundaries and radio frequencies current.