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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.

FAA aeronautical chart visual associated with “Changeover point — VHF/UHF low/high charts” (source page 83).
Changeover point — VHF/UHF low/high charts — source page 83.
FAA aeronautical chart visual associated with “Changeover point — LF/MF low/high charts” (source page 83).
Changeover point — LF/MF low/high charts — source page 83.
FAA aeronautical chart visual associated with “Holding pattern — VHF/UHF” (source page 83).
Holding pattern — VHF/UHF — source page 83.
FAA aeronautical chart visual associated with “Holding pattern — LF/MF” (source page 83).
Holding pattern — LF/MF — source page 83.
FAA aeronautical chart visual associated with “Holding pattern maximum restriction — 210 knots” (source page 83).
Holding pattern maximum restriction — 210 knots — source page 83.
All Altitudes Are MSL Unless Otherwise Noted.
Directional MEAs
MEAs are shown on IFR High Altitude Charts when MEA is other than 18,000’.

MINIMUM ENROUTE ALTITUDE (MEA) GAP

MEA is established when there is a gap in navigation signal coverage.

Maximum Authorized Altitude (MAA)

All Altitudes Are MSL Unless Otherwise Noted.
MAAs are shown on IFR High Altitude Charts when MAA is other than 45,000’.

Minimum Obstruction Clearance Altitude (MOCA)

All Altitudes Are MSL Unless Otherwise Noted.
See Low Enroute Chart Example below for examples of both MTAs and MCAs.
MEA, MOCA and/or MAA change at other than NAVAIDs
Changeover Point giving mileage to NAVAIDs (Not shown at midpoint locations.)
RNAV Holding Pattern Magnetic Reference Bearing is determined by the isogonic value at the waypoint or fix.
Holding Pattern with maximum restriction airspeed 210K applies to altitudes 6000’ to and including 14000’. 175K applied to all altitudes. Airspeed depicted is Indicated Airspeed (IAS)