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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.

Part-time FSS
FAA aeronautical chart visual associated with “Low-chart part-time FSS — Palmer” (source page 80).
Low-chart part-time FSS — Palmer — source page 80.
Stand Alone RCO
FAA aeronautical chart visual associated with “Low-chart stand-alone RCO — Leesburg” (source page 80).
Low-chart stand-alone RCO — Leesburg — source page 80.
RCO Associated/Co-located
with an Airport
FAA aeronautical chart visual associated with “Low-chart RCO with airport — Fort Myers/Miami” (source page 80).
Low-chart RCO with airport — Fort Myers/Miami — source page 80.
FAA aeronautical chart visual associated with “Stand-alone AWOS/ASOS — Boone / Stampede Pass” (source page 80).
Stand-alone AWOS/ASOS — Boone / Stampede Pass — source page 80.
Stand Alone FSS
FAA aeronautical chart visual associated with “High-chart stand-alone FSS — McGrath” (source page 80).
High-chart stand-alone FSS — McGrath — source page 80.
Stand Alone FSS Associated with an Airport
FAA aeronautical chart visual associated with “High-chart FSS with airport — Sitka” (source page 80).
High-chart FSS with airport — Sitka — source page 80.
Stand Alone RCO
FAA aeronautical chart visual associated with “High-chart stand-alone RCO — Montgomery” (source page 80).
High-chart stand-alone RCO — Montgomery — source page 80.
RCO Associated/Co-located
with an Airport
FAA aeronautical chart visual associated with “High-chart RCO with airport — Douglas/Casper” (source page 80).
High-chart RCO with airport — Douglas/Casper — source page 80.
RADIO AIDS TO NAVIGATION (Continued) Stand Alone Flight Services and Communication Outlets Flight Service Station (FSS) - Alaska Only Shadow NAVAID boxes indicate Flight Service Station (FSS) locations. Frequency 122.2 (Conterminous U.S) and 121.5 and 243.0 (Alaska) are available at many FSSs and are not shown. All other frequencies are shown above the box. Certain FSSs provide Local Airport Advisory (LAA) on 123.6. Frequencies transmit and receive except those followed by R and T: R - Receive Only T - Transmit Only Remote Communications Outlet (RCO) Thin line NAVAID boxes without frequencies and controlling FSS name indicate no FSS frequencies available. Frequencies positioned above the thin line boxes are remoted to the NAVAID sites. Other frequencies at the controlling FSS named are available, however altitude and terrain may determine their reception. Stand Alone AWOS & ASOS LOW CHARTS Stand Alone FSS Stand Alone FSS Associated with an Airport Part-time FSS Stand Alone RCO RCO Associated/Co-located with an Airport HIGH CHARTS Stand Alone FSS Stand Alone FSS Associated with an Airport Stand Alone RCO RCO Associated/Co-located with an Airport CASPER 122.4 MON DOUGLAS Converse County (DGW)
Source page 81

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