World aeronautical chart
A World Aeronautical Chart (WAC) is a type of
aeronautical chartused for navigation by pilots flying primarily moderate speed aircraftand aircraft operating at high altitudes. They are produced at a scale of 1:1,000,000 (approximately 1 inch = 13.7 nautical miles or 16 statute miles).
These charts are similar to
sectional charts and the symbols are the same except there is less detail due to the smaller scale, and because of this, it is seldom used for visual flight rulesflight. WACs show topographicinformation, airports and radio navigational aids. They are primarily useful for strategic flight planning, where a comprehensive view of the entire flight area is useful.
These charts are revised annually except several
Alaskan charts and the Mexican/ Caribbeancharts which are revised every 2 years. Australian WAC charts are amended every 3 to 5 years.
A set of 12 WACs covers the continental United States and 8 others cover Alaska.
Canadianairspace is covered by a set of 18 WACs.
Unlike sectional charts, North American WACs are named according to an international "grid system" having a combination of letters and numbers. For example, WAC CF-16 covers the
Pacific Northwest, and E-15 covers the British Columbiaarea. Letters progress from A at the north poleto U at the southern tip of Argentina. The numbers generally progress from 1 at the Greenwich meridianand increasing to the east, to a maximum of 29, depending upon the number of charts required at that latitude.
The 43 Australian WACs are indexed according to a geographic name or a corresponding 4-digit number.
Aeronautical chart conventions (United States)
*Operational navigation chart (
ONC) (which do not show controlled airspace boundaries)
----Source: FAA Pilot's Handbook
Wikimedia Foundation. 2010.
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