Definition
World Aeronautical Charts (WAC) are aeronautical charts published at a scale of 1:1,000,000 that cover land areas of the world at a size and detail suitable for navigation by moderate-speed aircraft and aircraft operating at higher altitudes. They depict cities, towns, roads, railroads, prominent landmarks, terrain relief, drainage features, and aeronautical information including airports, airways, restricted areas, obstructions, and other navigational aids.
Plain English
A type of large-area aviation map that shows a wider region on one sheet than a sectional chart does, with less fine detail. It's designed for faster aircraft or higher-altitude flying where you cover more ground and don't need every small feature.
Context Anchor
Seen in FAA chart discussions and older navigation references, including material that explains how aviation charts and procedure information are interpreted.
Derivation
"World Aeronautical" reflects the chart series' original purpose: a globally consistent set of charts using the same scale (1:1,000,000) so pilots flying internationally would see the same level of detail everywhere. The name signals coverage breadth, not that one chart shows the whole world.
Why Pilots Care
They help pilots visualize terrain and plan longer visual cross-country flights where sectional charts would be too detailed.
Intuition Check
World does not mean one chart of the whole Earth. Here it means a chart series that covers large areas at a broad scale.
Example Sentence 1
For the long cross-country at altitude, he planned with a World Aeronautical Chart rather than carrying multiple sectionals.
Example Sentence 2
WACs cover far more ground than sectionals, making them useful for long VFR legs.