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Aeronautical Chart Users’ Guide

FAA Chart Users’ Guide Version 9 July 2026
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IFR Enroute Low/High Altitude Symbols

IFR low- and high-altitude enroute chart legends, symbols, examples, and procedures.

AIRSPACE - U.S.

CLASS E

Open Area (White)
The controlled airspace below 14,500’ MSL that is not Class B, C or D.
Federal Airways from 1,200’ AGL to but not including 18,000’ MSL (unless otherwise specified).
Other designated control areas below 14,500’ MSL.
Not Charted
That airspace from 14,500’ MSL to but not including 18,000’ MSL, including the airspace overflying the waters within 12 NM of the coast of the contiguous United States and Alaska and designated offshore areas, excluding the Alaska peninsula west of longitude 160°00’00” W, and the airspace less than 1,500’ AGL.
FAA aeronautical chart visual associated with “Class G screened-brown-area swatch” (source page 91).
Class G screened-brown-area swatch — source page 91.
FAA aeronautical chart visual associated with “Class G low/high-chart example — Albuquerque ARTCC / St Johns / Springerville” (source page 91).
Class G low/high-chart example — Albuquerque ARTCC / St Johns / Springerville — source page 91.
Airspace Information (Continued) AIRSPACE - U.S. CLASS E Low Chart Only Controlled Airspace CLASS G High and Low Chart Uncontrolled Airspace Open Area (White) The controlled airspace below 14,500’ MSL that is not Class B, C or D. Federal Airways from 1,200’ AGL to but not including 18,000’ MSL (unless otherwise specified). Other designated control areas below 14,500’ MSL. Not Charted That airspace from 14,500’ MSL to but not including 18,000’ MSL, including the airspace overflying the waters within 12 NM of the coast of the contiguous United States and Alaska and designated offshore areas, excluding the Alaska peninsula west of longitude 160°00’00” W, and the airspace less than 1,500’ AGL. Screened Brown Area Low Altitude That portion of the airspace below 14,500’ MSL that has not been designated as Class B, C, D or E Airspace. High Altitude That portion of the airspace from 18,000’ MSL and above that has not been designated as Class A airspace. Example:
Source page 92

AIRSPACE INFORMATION (Continued)

Special Use Airspace - U.S.

FAA aeronautical chart visual associated with “P-56 prohibited area — Washington, D.C., Area A-1 Chart example” (source page 92).
P-56 prohibited area — Washington, D.C., Area A-1 Chart example — source page 92.
FAA aeronautical chart visual associated with “P-40 and R-4009 prohibited/restricted area — Washington, D.C., Area A-1 Chart example” (source page 92).
P-40 and R-4009 prohibited/restricted area — Washington, D.C., Area A-1 Chart example — source page 92.
FAA aeronautical chart visual associated with “Special Use Airspace - U.S.” (source page 92).
Special Use Airspace - U.S. — source page 92.
FAA aeronautical chart visual associated with “Special Use Airspace - U.S.” (source page 92).
Special Use Airspace - U.S. — source page 92.
FAA aeronautical chart visual associated with “Special Use Airspace - U.S.” (source page 92).
Special Use Airspace - U.S. — source page 92.
FAA aeronautical chart visual associated with “Special Use Airspace - U.S.” (source page 92).
Special Use Airspace - U.S. — source page 92.