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Aeronautical Charts Terms and Symbols
VFR Aeronautical Charts
Explanation of VFR Terms and Symbols

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Aeronautical Charts
Terms and Symbols

VFR Aeronautical Charts

Explanation of VFR Terms
and Symbols

VFR Chart Symbols


Radio Aids to Navigation

Airspace Information

Navigational and Procedural




Helicopter Route Charts

VFR Flyway Planning

IFR Aeronautical Charts

Explanation of IFR
Terms and Symbols

IFR Chart Symbols

IFR Enroute Low/High
(US and Alaska Charts)

Oceanic Route Charts
North Atlantic and
North Pacific Route Charts

Temporary Flight Restriction (TFR) Areas
Relating to National Security are indicated with a
broken blue line . A Temporary Flight
Restriction (TFR) is a type of Notice to Airmen (NOTAM).
A TFR defines an area restricted to air travel due to
a hazardous condition, a special event, or a general
warning for the entire airspace. The text of the actual
TFR contains the fine points of the restriction. It is important
to note that only TFRs relating to National Security
are charted.

Air Defense Identification Zones (ADIZs) are symbolized
using the ADIZ symbol:
As defined in 14 CFR Part 99, an ADIZ is an area in
which the ready identification, location, and control of
all aircraft is required in the interest of national security.
ADIZ boundaries include Alaska, Canada and the
Contiguous U.S.

Terminal Radar Service Areas (TRSAs) are
shown in their entirety, symbolized by a screened
black outline of the entire area including the various
sectors within the area .

The outer limit of the entire TRSA is a continuous
screened black line. The various sectors within the
TRSA are symbolized by slightly narrower screened
black lines.

Each sector altitude is identified in solid black
color by the MSL ceiling and floor values of the respective
sector, eliminating the last two digits. A leader line
is used when the altitude values must be positioned
outside the respective sectors because of space limitations.
The TRSA name is shown near the north position
of the TRSA as follows: . Associated
frequencies are listed in a table on the chart

Military Training Routes (MTRs) are shown
on Sectionals and TACs. They are identified by the
route designator: . Route
designators are shown in solid black on the route
centerline, positioned along the route for continuity. The
designator IR or VR is not repeated when two or more
routes are established over the same airspace, e.g.,
IR201-205-227. Routes numbered 001 to 099 are
shown as IR1 or VR99, eliminating the initial zeros.
Direction of flight along the route is indicated by small
arrowheads adjacent to and in conjunction with each
route designator.

There are IFR (IR) and VFR (VR) routes as
Route identification:
a. Routes at or below 1500' AGL (with no segment
above 1500') are identified by four-digit
numbers; e.g., VR1007, etc. These routes are
generally developed for flight under Visual
Flight Rules.
b. Routes above 1500' AGL (some segments
of these routes may be below 1500') are identified
by three or fewer digit numbers; e.g.,
IR21, VR302, etc. These routes are developed
for flight under Instrument Flight Rules.

MTRs can vary in width from 4 to 16 miles. Detailed
route width information is available in the Flight
Information Publication (FLIP) AP/1B (a DoD publication),
or in the Digital Aeronautical Chart Supplement
(DACS) produced by AeroNav Services.

Special Military Activity areas are indicated
on the Sectionals by a boxed note in black type. The
note contains radio frequency information for obtaining
area activity status.

TAC coverage is shown on appropriate Sectionals
by a 1/4" masked line as indicated below.
Within this area, pilots should use TACs, which provide
greater detail and clarity of information. A note to this
effect appears near the masked boundary line.

The following note appears on Sectionals and TACs covering the conterminous United States.

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