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Aeronautical Chart Users’ Guide

FAA Chart Users’ Guide Version 9 July 2026
All Library Documents

IFR Enroute Low/High Altitude Symbols

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

IFR within controlled airspace as assigned by ATC.
ALL courses are magnetic.

Cruising Altitudes - High Charts - U.S. Only

IFR within controlled airspace 18,000’ MSL to FL280
as assigned by ATC
FAA aeronautical chart visual associated with “All courses are magnetic.” (source page 94).
All courses are magnetic. — source page 94.
All courses are magnetic.
RVSM Levels FL290 to FL410 FL430 and above
FAA aeronautical chart visual associated with “RVSM cruising altitudes — flight levels FL290 through FL410” (source page 94).
RVSM cruising altitudes — flight levels FL290 through FL410 — source page 94.
FAA aeronautical chart visual associated with “No VFR or VFR On Top” (source page 94).
No VFR or VFR On Top — source page 94.
No VFR or VFR On Top
authorized above FL285 in
RVSM airspace.
Cruising Altitudes - Low Charts - U.S. Only IFR outside controlled airspace. IFR within controlled airspace as assigned by ATC. ALL courses are magnetic. VFR above 3000’ AGL unless otherwise authorized by ATC. Cruising Altitudes - High Charts - U.S. Only IFR within controlled airspace 18,000’ MSL to FL280 as assigned by ATC All courses are magnetic. VFR or VFR On Top add 500’ No VFR flights within Class A Airspace above 3000’ AGL unless otherwise authorized RVSM Levels FL290 to FL410 FL430 and above No VFR or VFR On Top authorized above FL285 in RVSM airspace. NAVIGATIONAL AND PROCEDURAL INFORMATION
Source page 95

Navigational and Procedural Information (Continued)

FAA aeronautical chart visual associated with “Isogonic line/value — 10°W” (source page 95).
Isogonic line/value — 10°W — source page 95.
FAA aeronautical chart visual associated with “Enlargement-area callout — See Washington Area Chart A-1 for detail” (source page 95).
Enlargement-area callout — See Washington Area Chart A-1 for detail — source page 95.
FAA aeronautical chart visual associated with “Time-zone boundary — Mountain Standard +7 UTC / Central Standard +6 UTC” (source page 95).
Time-zone boundary — Mountain Standard +7 UTC / Central Standard +6 UTC — source page 95.
FAA aeronautical chart visual associated with “Low/high chart match mark symbol” (source page 95).
Low/high chart match mark symbol — source page 95.