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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.

discrete VHF and UHF frequencies

Air Route Traffic Control Center (ARTCC) with Controller Pilot Data Link Communications (CPDLC)

FAA aeronautical chart visual associated with “Altimeter-setting-change boundary — QNH / QNE 29.92” (source page 88).
Altimeter-setting-change boundary — QNH / QNE 29.92 — source page 88.

Control Areas (CTA)

FAA aeronautical chart visual associated with “CTA/adjoining-CTA boundary examples” (source page 88).
CTA/adjoining-CTA boundary examples — source page 88.

Additional Control Areas

FAA aeronautical chart visual associated with “Additional Control Areas — CONTROL 1141L / CONTROL 1419H” (source page 88).
Additional Control Areas — CONTROL 1141L / CONTROL 1419H — source page 88.
LOW ALTITUDE
HIGH ALTITUDE

Foreign Airspace Note

FAA aeronautical chart visual associated with “Foreign Airspace Note” (source page 88).
Foreign Airspace Note — source page 88.
FAA aeronautical chart visual associated with “Foreign-airspace CPDLC boundary examples — Atlanta and Jacksonville” (source page 88).
Foreign-airspace CPDLC boundary examples — Atlanta and Jacksonville — source page 88.
Enroute Chart Examples High Enroute Chart (Continued) Reference Number 3 Description Preferred Directional Jet Route with Time Restrictions, MAA and MEA Jet Route 149 available between 1100 - 0300Z MAA - 41,000’ MEA - 31,000’ AIRSPACE INFORMATION (Continued) AIRSPACE BOUNDARIES LOW / HIGH CHARTS Air Defense Identification Zone (ADIZ) CAN ADA ADIZ ALASKA ADIZ Adjoining ADIZ Air Traffic Service LOW / HIGH CHARTS Identification Data Ceiling Floor Call Sign Frequency Ceiling Floor Call Sign Frequency Flight Information Regions (FIR) LOW / HIGH CHARTS Upper Information Regions (UIR) Upper Control Areas (UTA) LOW / HIGH CHARTS Air Route Traffic Control Center (ARTCC) ARTCC Remoted Sites with discrete VHF and UHF frequencies Air Route Traffic Control Center (ARTCC) with Controller Pilot Data Link Communications (CPDLC) Altimeter Setting Change LOW / HIGH CHARTS Control Areas (CTA) Adjoining CTA Additional Control Areas LOW ALTITUDE HIGH ALTITUDE Foreign Airspace Note ARTCC Name Site Name Frequency MIAMI O C EANIC C TA/FIR KZMA NEW YO RK O CEAN IC CTA/FIR KZWY CONTROL 1419 H NOTE: Limited chart information provided outside U.S. airspace. Refer to DoD (NGA) or foreign charts and flight information publications outside U.S. airspace.
Source page 89

AIRSPACE INFORMATION (Continued)

Airspace - U.S.
Open Area (White)
That airspace from 18,000’ MSL to and including FL 600, including the airspace overflying the waters within 12 NM of the coast of the contiguous United States and Alaska and designated offshore areas, excluding Santa Barbara Island, Farallon Island, the airspace south of latitude 25° 04’00” N, the Alaska peninsula west of longitude 160°00’00” W, and the airspace less than 1,500’ AGL.
That airspace from 18,000’ MSL to and including FL 450, including Santa Barbara Island, Farallon Island, the Alaska peninsula west of longitude 160°00’00” W, and designated offshore areas.
FAA aeronautical chart visual associated with “Class B schematic with Mode C / ADS-B Out 30-NM boundary — Salt Lake City” (source page 89).
Class B schematic with Mode C / ADS-B Out 30-NM boundary — Salt Lake City — source page 89.