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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.

Low and High Enroute Airway Data:

Victor Airways

FAA aeronautical chart visual associated with “Victor Airways — Low Enroute Charts” (source page 81).
Victor Airways — Low Enroute Charts — source page 81.

LF/MF Airway

FAA aeronautical chart visual associated with “LF/MF Airway — Low Enroute Charts” (source page 81).
LF/MF Airway — Low Enroute Charts — source page 81.

RNAV T Route

FAA aeronautical chart visual associated with “RNAV T Route — Low Enroute Charts” (source page 81).
RNAV T Route — Low Enroute Charts — source page 81.
GNSS Required
FAA aeronautical chart visual associated with “RNAV TK Helicopter Route — Low Enroute Charts” (source page 81).
RNAV TK Helicopter Route — Low Enroute Charts — source page 81.
GNSS Required

Preferred Direction Victor Route

FAA aeronautical chart visual associated with “Preferred Direction Victor Route” (source page 81).
Preferred Direction Victor Route — source page 81.

Unusable Route Segment

FAA aeronautical chart visual associated with “Unusable Route Segment — Low Enroute Charts” (source page 81).
Unusable Route Segment — Low Enroute Charts — source page 81.

Military Training Routes (MTR)

MTRs 5NM or less both sides
FAA aeronautical chart visual associated with “Military Training Route 5 NM or less on both sides of centerline” (source page 81).
Military Training Route 5 NM or less on both sides of centerline — source page 81.
of centerline
MTRs greater than 5NM either
FAA aeronautical chart visual associated with “Military Training Route greater than 5 NM on either or both sides of centerline” (source page 81).
Military Training Route greater than 5 NM on either or both sides of centerline — source page 81.