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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.

No Voice Communications
(Y) Mode DME
(AK only) Shadow NAVAID Box
FSS Associated with NAVAID
RADIO AIDS TO NAVIGATION (Continued) Navigation And Communication Boxes - Examples (Continued) LOW ENROUTE CHARTS VOR/DME No Voice Communications (Y) Mode DME R - Receive only 122.1R Controlling FSS Name - BUFFALO (AK only) Shadow NAVAID Box FSS Associated with NAVAID TACAN TACAN Channels are without voice but not underlined Part Time NAVAID VORTAC Shutdown status DME DME Channel, Ident, Morse Code, VHF Frequency NDB A - ASOS/AWOS Available Shutdown status NDB/DME No Voice Communications (Y) Mode DME (AK only) Shadow NAVAID Box FSS Associated with NAVAID HIGH ENROUTE CHARTS VOR/DME Off Route (Greyed NAVAID Box and NAVAID) DME in Y Mode (AK only) Shadow NAVAID Box FSS Associated with NAVAID TACAN Off Route Off Route - Part Time NAVAID (Greyed NAVAID Box and NAVAID) VORTAC Off Route (Greyed NAVAID Box and NAVAID) DME DME Channel, Ident, VHF Frequency NDB NDB/DME No Voice Communications (Y) Mode DME (AK only) Shadow NAVAID Box FSS Associated with NAVAID Notes: Morse Code is not shown on High NAVAID Boxes.
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)

Stand Alone AWOS & ASOS

Stand Alone FSS
FAA aeronautical chart visual associated with “Low-chart stand-alone FSS — Homer” (source page 80).
Low-chart stand-alone FSS — Homer — source page 80.
Stand Alone FSS Associated with an Airport
FAA aeronautical chart visual associated with “Low-chart FSS with airport — Dillingham” (source page 80).
Low-chart FSS with airport — Dillingham — source page 80.