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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.

Off Route (Greyed NAVAID Box
and NAVAID)
DME in Y Mode
(AK only) Shadow NAVAID Box
FSS Associated with NAVAID
FAA aeronautical chart visual associated with “High-enroute TACAN — off-route Tyndall / off-route part-time Pensacola” (source page 79).
High-enroute TACAN — off-route Tyndall / off-route part-time Pensacola — source page 79.
Off Route
Off Route - Part Time NAVAID
(Greyed NAVAID Box and NAVAID)
FAA aeronautical chart visual associated with “High-enroute VORTAC — Alexandria / off-route Handle” (source page 79).
High-enroute VORTAC — Alexandria / off-route Handle — source page 79.
Off Route (Greyed NAVAID Box
and NAVAID)

DME

FAA aeronautical chart visual associated with “High-enroute DME — off-route Dunkirk” (source page 79).
High-enroute DME — off-route Dunkirk — source page 79.
DME Channel, Ident,
VHF Frequency

NDB

FAA aeronautical chart visual associated with “High-enroute NDB — Fort Davis” (source page 79).
High-enroute NDB — Fort Davis — source page 79.

NDB/DME

FAA aeronautical chart visual associated with “High-enroute NDB/DME — Cape Newenham no-voice/Y-mode / Iliamna shadow” (source page 79).
High-enroute NDB/DME — Cape Newenham no-voice/Y-mode / Iliamna shadow — source page 79.